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Rhodizite
Rhodizite is borates, (K,Cs)Al4Be4(B,Be)12O28. In the hand, it rates 8 to 8.5 on the Mohs scale, and it runs pale yellow and greenish yellow. Small glassy straw-yellow isometric crystals of exceptional hardness (8+), typically perched on Madagascan rubellite or quartz. Pegmatites of Madagascar (Antandrokomby, Sahatany Valley); historic finds in the Urals (Russia).
The geology.
Rhodizite carries the formula (K,Cs)Al4Be4(B,Be)12O28. It belongs to the isometric system. The trade files it under borates.
It sits at 8 to 8.5 on the Mohs scale. The surface reads vitreous to adamantine. Light behaviour is transparent to translucent. Specific gravity runs 3.34 to 3.44. The streak is white. It breaks with no cleavage; conchoidal fracture.
Small glassy straw-yellow isometric crystals of exceptional hardness (8+), typically perched on Madagascan rubellite or quartz.
Common cuts are small dodecahedral/tetrahedral crystals, crystals on tourmaline matrix or tumbled (rare).
The origins.
Pegmatites of Madagascar (Antandrokomby, Sahatany Valley); historic finds in the Urals (Russia).
On value, the database notes: collector rarity; genuine crystals are small and priced above their size.
Traditional associations.
In energy work traditions, associated with amplifying intention and other stones.
Included for completeness. Tradition is worth knowing about, and it is worth keeping separate from the mineralogy.
Spotting the real thing.
Small glassy straw-yellow isometric crystals of exceptional hardness (8+), typically perched on Madagascan rubellite or quartz.
Pale garnet or quartz fragments are sold as rhodizite in metaphysical markets; the hardness test is decisive.
| Looks like | How to tell them apart |
|---|---|
| Yellow garnet (grossular) | Garnet tops out near 7.5; rhodizite scratches quartz and even topaz-adjacent materials |
| Pale citrine point | Citrine forms hexagonal prisms, not equant dodecahedra |
| Microlite crystal | Microlite is heavier (SG 4.2 to 6.4) and usually browner |
At-home tests.
These checks cost nothing. Daylight, a 10x loupe and a little patience are the whole kit for rhodizite.
| Test | What you should see |
|---|---|
| Scratch check | Scratches quartz with ease (8 to 8.5) |
| By eye | Equant isometric crystal shape |
| By eye | Light straw color with adamantine sparkle |
Stop short of anything that leaves a mark. A gemologist can answer the rest without damaging the stone.
Care & handling.
At 8 to 8.5 on the Mohs scale it stands up to everyday wear. It will still chip on a hard knock, so treat edges and points with respect.
It breaks with no cleavage; conchoidal fracture, which is worth knowing before you set it or drop it.
Skip the ultrasonic. Lukewarm water, mild soap and a soft cloth handle routine cleaning without risk.
Beryllium-bearing: avoid grinding dust; whole crystals are safe to handle.
A deeper look.
Extended detail on composition, sourcing, authentication and market value.
The physical record
The formula on record is (K,Cs)Al4Be4(B,Be)12O28. Crystal system: Isometric. Specific gravity: 3.34 to 3.44. Streak: White. Cleavage and fracture: No cleavage; conchoidal fracture.
How it reaches the market
Pegmatites of Madagascar (Antandrokomby, Sahatany Valley); historic finds in the Urals (Russia).
What it gets confused with
Yellow garnet (grossular): Garnet tops out near 7.5; rhodizite scratches quartz and even topaz-adjacent materials. Pale citrine point: Citrine forms hexagonal prisms, not equant dodecahedra. Microlite crystal: Microlite is heavier (SG 4.2 to 6.4) and usually browner.
What it is worth
Collector rarity; genuine crystals are small and priced above their size.
Where buyers get caught
Pale garnet or quartz fragments are sold as rhodizite in metaphysical markets; the hardness test is decisive.
One more thing
Energy-marketing folklore made tiny rhodizite crystals famous as 'master crystals'; mineralogically the fame should be its hardness, in the league just under corundum.
An education-first guide.
We do not carry rhodizite. This page exists because the question comes up and the honest answer is worth writing down, whether or not there is anything here to sell you.
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