Single review
National Geographic Mega Crystal Growing Kit Review
Reviewed from National Geographic's published specifications. We have not grown them, and the growing time is the number that decides the purchase.
By Sawyer V. · Published
The short answer
The National Geographic Mega Crystal Growing Kit is the crystal kit to buy if the child is impatient. It publishes 8 crystals growing in 3 to 4 days, 8 colors of growing powder, 8 seed rocks, 2 silicone growing chambers, 5 real specimens and a USB-powered light-up display base, rated 8-12.
Block & Beaker earns a commission when you buy through our links, at no cost to you. It never changes a ranking, and we say so plainly when the right answer is the cheaper set, or nothing at all. Full disclosure · How we pick.
At a glance
The picks, ranked
Tap any row to jump to the full reasoning. Prices come live from Amazon where we have them and read “check price” where we don’t — never a number we cannot stand behind today.
| # | Product | Best for | Price |
|---|---|---|---|
| 1 | The product NATIONAL GEOGRAPHIC Mega Crystal Growing Kit Eight crystals in 3-4 days, and five real mineral specimens you keep. | Eight to twelve | |
| 2 |  The cheaper, slower one 4M Crystal Growing Experiment Kit Seven experiments with display bases and covers for each. | Ten and up | |
| 3 |  Real minerals, no waiting NATIONAL GEOGRAPHIC Break Open 10 Premium Geodes 10 hand-selected geodes to crack open, with goggles and display stands. | Eight and up | |
| — |  If one subject is not enough NATIONAL GEOGRAPHIC Mega Science Lab 45 experiments plus 85+ household ones, including crystal growth. | Eight and up |
4 picks, including 1 we tell you to skip. Ages shown are the manufacturer’s own rating, not ours.
What we can tell you, and what we cannot
We have not grown these crystals. No lab, no samples, no test children, and no star rating on this page or in its structured data.
National Geographic publishes the crystal count, the growing time, the powder and seed counts, the five named specimens and the display base. Whether all eight crystals form cleanly at the first attempt, we cannot tell you — crystal growing is famously sensitive to temperature and disturbance.
The specification that decides it
The arithmetic
Nat Geo Mega Crystal Growing Kit, published
| Crystals grown | 8, published as growing in 3 to 4 days |
|---|---|
| Growing supplies | 8 colors of powder, 8 seed rocks, 2 silicone chambers |
| Real specimens | 5 — quartz, rose quartz, fluorite, calcite, amethyst |
| Display | USB-powered light-up display base |
| Also included | Stir stick, magnifying glass, full-color STEM learning guide |
| Stated age | 8-12 |
What the numbers mean in practice
Eight crystals, two chambers, four rounds. At 3 to 4 days per round that is roughly a fortnight of project rather than a single weekend — good for engagement, but plan the sequence rather than promising all eight by Sunday.
Three to four days is fast for this category. Crystal chemistry rewards patience, and the shortest published times are what keep a child checking a chamber instead of forgetting it.
The display base is not a gimmick. A grown crystal looks like a lump in daylight and like a gemstone lit from beneath. For a kit whose whole output is display objects, lighting is a reasonable part of the product.
The powder is the kit. When it is gone, the kit is finished — unlike the five specimens and the base, which are permanent. That is the honest shape of every crystal-growing product.
Growing crystals is a patience skill
The thing being taught here is not really crystallography, it is delayed gratification with a visible payoff. A child sets up a solution, does nothing for three days, and gets a result that could not have been hurried.
That is a rare lesson in a toy box full of instant reactions, and it is why crystal kits keep selling. It also means the kit fails in a household that wants an activity for a rainy afternoon — three days is three days.
Two practical notes from the published contents: the chambers are silicone, so they want a stable shelf where they will not be knocked, and the magnifying glass is there because the interesting part is the facet structure rather than the size.
Worth knowing before you buy
The magnifying glass matters at the end. It is published in the contents, and the facet structure it reveals is what separates a grown crystal from a colored lump on a shelf.
Who should skip it
Anyone who wants a result today. The geode set publishes 10 geodes with the crystals already inside.
Children over twelve. The published band ends there; a real microscope or a chemistry set is the next step.
Households that already own the Mega Science Lab. It publishes glow-in-the-dark crystal growth among its 45 experiments.
Where it sits
This kit appears in crystal growing kits, rock and geology kits and STEM toys for 10 year olds.
In full
Every pick, and what is wrong with it
Published specifications only, each linked back to the page it came from. Where a manufacturer publishes nothing, the row says so — we do not fill blanks in.
1. The product
NATIONAL GEOGRAPHIC Mega Crystal Growing Kit
National Geographic · Mega Crystal Growing Kit · maker rates it 8-12
Eight crystals in 3-4 days, and five real mineral specimens you keep.
- Crystals grown
- 8, published as growing in 3 to 4 days
- Growing supplies
- 8 colors of crystal growing powder, 8 seed rocks, 2 silicone growing chambers
- Real specimens included
- 5 — quartz, rose quartz, fluorite, calcite and amethyst
- Display
- USB-powered light-up display base
National Geographic publishes 8 crystals grown in 3 to 4 days, with 8 colors of crystal growing powder, 8 seed rocks and 2 silicone growing chambers, plus 5 real specimens — quartz, rose quartz, fluorite, calcite and amethyst — a USB-powered light-up display base, a stir stick, a magnifying glass and a full-color STEM learning guide. Stated age 8-12, consumable: the powder is the product.
Three to four days is the specification that matters most here. Crystal kits fail when the published growing time outruns a child’s patience, and 4M publishes experiments where results take days on their own schedule.
The five real specimens are the part that survives the kit. When the powder is gone, a child still owns quartz, rose quartz, fluorite, calcite and amethyst, which is the start of a mineral collection rather than a shelf of grown lumps.
Replay signal
- Open-ended or one-shot
- Eight results, then the growing half is finished
- Does anything run out
- Yes — eight powders, eight crystals
- Room to grow
- The five natural specimens and the magnifier outlive the powders
- Adult required
- For hot water at the mixing stage
Why we say so: National Geographic publishes eight growing powders and, separately, five real mineral specimens. That split matters: the grown crystals end after eight, and the natural specimens are permanent — so this is the crystal kit that leaves something behind.
What’s wrong with it
The growing powder is the product, so the kit has a definite end.
| Crystals grown | 8, published as growing in 3 to 4 days |
|---|---|
| Growing supplies | 8 colors of crystal growing powder, 8 seed rocks, 2 silicone growing chambers |
| Real specimens included | 5 — quartz, rose quartz, fluorite, calcite and amethyst |
| Display | USB-powered light-up display base |
| Also included | Stir stick, magnifying glass, full-color STEM learning guide |
| Stated age | 8-12 |
| Consumables | Yes — the growing powder is the product |
Every figure above is from National Geographic toys, Mega Crystal Growing Kit. Blanks are shown as “not published” rather than filled in.
2. The cheaper, slower one
4M Crystal Growing Experiment Kit
4M · 5557 · maker rates it 10+
Seven experiments with display bases and covers for each.
- Experiments
- 7 crystal-growing experiments
- Contents
- 3 bags of crystal compound, 3 bags of seeding mixture, stirring bowl and spoon, 7 display bases, 7 display covers, 7 ring templates
- Stated age
- 10 years and up
- Consumables
- Yes — the compound is the whole product
4M publishes 7 crystal-growing experiments with 3 bags of crystal compound, 3 bags of seeding mixture, a stirring bowl and spoon, 7 display bases, 7 display covers and 7 ring templates, rated 10 years and up, where time per experiment is days rather than minutes.
Fewer results, two years later, and no real minerals in the box. Its advantage is seven proper display covers. See the 4M crystal kit review.
Replay signal
- Open-ended or one-shot
- One-shot, seven times over
- Does anything run out
- Definitively. Three bags of compound, and when they are gone the kit is a set of display cases
Why we say so: 4M publishes three bags of crystal compound across seven experiments. That is the arithmetic that decides this purchase: it is seven results, spread over weeks because crystals take days to grow, and then it is finished. Excellent as an event; poor as the main present.
What’s wrong with it
Published 10 and up, and growth takes days with no specimens included.
| Experiments | 7 crystal-growing experiments |
|---|---|
| Contents | 3 bags of crystal compound, 3 bags of seeding mixture, stirring bowl and spoon, 7 display bases, 7 display covers, 7 ring templates |
| Stated age | 10 years and up |
| Consumables | Yes — the compound is the whole product |
| Time per experiment | Days, not minutes — crystals grow on their own schedule |
Every figure above is from 4M, Crystal Growing Experiment Kit. Blanks are shown as “not published” rather than filled in.
3. Real minerals, no waiting
NATIONAL GEOGRAPHIC Break Open 10 Premium Geodes
National Geographic · NGGEO10 · maker rates it 8+
10 hand-selected geodes to crack open, with goggles and display stands.
- Geodes
- 10, hand-selected, 1.25 to 2.25 inches across
- Includes
- Safety goggles, magnifying glass, display stands, full-color learning guide
- Stated age
- Manufacturer's minimum age 8 years
- Safety note
- Contains small parts; not for children under 3
National Geographic publishes 10 hand-selected geodes, 1.25 to 2.25 inches across, with safety goggles, a magnifying glass, display stands and a full-color learning guide, minimum age 8 years, containing small parts and not for children under 3.
No growing time at all: the crystals are already inside and 300 million years old. For a child who wants the result today, this is the better box.
Replay signal
- Open-ended or one-shot
- One-shot by design. Ten geodes, ten moments, then it is a bowl of pretty rocks
- Does anything run out
- Yes, definitively — the clearest example on this site of a kit that ends
Why we say so: National Geographic publishes the count as ten natural geodes. Ten single-use items is a finite number, and we would rather say so than let a gift-buyer find out on Christmas afternoon.
What’s wrong with it
One crack each, and a hammer is involved.
| Geodes | 10, hand-selected, 1.25 to 2.25 inches across |
|---|---|
| Includes | Safety goggles, magnifying glass, display stands, full-color learning guide |
| Stated age | Manufacturer's minimum age 8 years |
| Safety note | Contains small parts; not for children under 3 |
| Consumables | Yes — ten geodes, and each one only cracks open once |
Every figure above is from National Geographic toys, Break Open Geodes. Blanks are shown as “not published” rather than filled in.
Skip this one
NATIONAL GEOGRAPHIC Mega Science Lab
National Geographic · Mega Science Lab · maker rates it 8+
45 experiments plus 85+ household ones, including crystal growth.
- Experiments in the kit
- 45, across chemistry, earth science and science magic
- Bonus guide
- 85+ further experiments using household items, for 130+ in total
- Includes
- Volcano build, glow-in-the-dark crystal growth, and the tools for both
- Stated age
- 8+
National Geographic publishes 45 experiments across chemistry, earth science and science magic plus a bonus guide of 85+ household experiments for 130+ in total, including a volcano build and glow-in-the-dark crystal growth, rated 8+.
Named here because buying both is common and wasteful. If crystals are the specific interest, the dedicated kit grows eight; if science generally is the interest, the lab covers far more ground.
Replay signal
- Open-ended or one-shot
- Guided, and the 45 in-kit experiments end. The 85 household ones do not
- Does anything run out
- The supplied materials run out; the household half of the book never does
- Room to grow
- The bonus guide is the genuinely durable part, and it costs the manufacturer almost nothing to include
- Adult required
- Supervision for the chemistry third; the earth science and household experiments are largely self-run
Why we say so: National Geographic publishes 45 in-kit experiments plus a bonus guide of 85+ using household items. That second number is why this kit outlasts most of its price band: roughly two-thirds of the published content needs nothing but a kitchen.
What’s wrong with it
Its crystal section is a fraction of a dedicated kit.
| Experiments in the kit | 45, across chemistry, earth science and science magic |
|---|---|
| Bonus guide | 85+ further experiments using household items, for 130+ in total |
| Includes | Volcano build, glow-in-the-dark crystal growth, and the tools for both |
| Stated age | 8+ |
| Consumables | Yes — the supplied chemicals and crystal compounds are used up |
Every figure above is from National Geographic toys, Mega Science Lab. Blanks are shown as “not published” rather than filled in.
We are not putting a buy button on this one. It is easy enough to find if you want it anyway — but we would rather send you to something that gets played with twice.
Questions people actually ask
Frequently asked
Is the Nat Geo Mega Crystal Growing Kit worth it?
For an eight- to twelve-year-old, yes. It publishes 8 crystals growing in 3 to 4 days, 8 colors of powder, 8 seed rocks, 2 silicone chambers, 5 real mineral specimens and a light-up display base. The powder is consumable; the specimens and base are not.
How long do the crystals take to grow?
National Geographic publishes 3 to 4 days. With two silicone chambers for eight crystals, that means roughly four rounds - about a fortnight of project rather than one weekend.
What age is the Mega Crystal Growing Kit for?
National Geographic publishes 8-12. The powders are chemicals, so treat the lower end as supervised. Crystal growing kits.
What do you keep when the powder runs out?
The five real specimens - quartz, rose quartz, fluorite, calcite and amethyst - plus the USB light-up display base, the magnifying glass and the grown crystals themselves.
Crystal growing kit or geodes?
Waiting against immediacy. This kit grows 8 crystals in 3 to 4 days each; the Break Open Geodes set publishes 10 hand-selected geodes whose crystals are already formed inside. Break Open Geodes review.
Can you grow more than two crystals at once?
Not in the supplied chambers - National Geographic publishes 2 silicone growing chambers for 8 crystals, which means roughly four rounds at 3 to 4 days each.
Which real specimens are included?
Five: quartz, rose quartz, fluorite, calcite and amethyst, alongside the growing supplies and the light-up display base.
Sources
Where these figures came from
Every specification on this page traces to one of these. If a manufacturer publishes nothing on a point, the page says so rather than filling the gap.
Read next
Where to go from here
Back to Reviews, or read how we pick.