Comparison · Minerals vs Quartz Family
Cryolite vs Clear Quartz
Cryolite and Clear Quartz are easy to confuse. Clear Quartz is harder (Mohs 7) than Cryolite (Mohs 2.5–3), so Clear Quartz will scratch Cryolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Below is a side-by-side comparison of their properties and the quick tests that separate them.
Key differences between Cryolite and Clear Quartz
- Clear Quartz is harder (Mohs 7) than Cryolite (Mohs 2.5–3), so Clear Quartz will scratch Cryolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
- Hold a thin edge to the light: Cryolite is Transparent to translucent, Clear Quartz is transparent.
- They overlap in clear, but Cryolite also comes in brown and red.
- Well-formed crystals give it away: Cryolite is Monoclinic, Clear Quartz is hexagonal.
Cryolite vs Clear Quartz properties
| Property | Cryolite | Clear Quartz |
|---|---|---|
| Type | Minerals | Quartz Family |
| Mohs hardness | 2.5–3 | 7 |
| Luster | Vitreous to greasy or pearly | vitreous |
| Streak | White | White |
| Transparency | Transparent to translucent | transparent |
| Specific gravity | 2.95–3.0 | 2.65 |
| Crystal system | Monoclinic | hexagonal |
| Common colors | Colorless, White, Brownish, Reddish | Colorless, White |
| Rarity | common | common |
| Typical specimen value | $2–$150+ | $5–$200+ |
Which is more valuable?
Clear Quartz is usually the more valuable of the two: a typical collector specimen runs about $25 against $20 for Cryolite, and premium Clear Quartz can reach $200 or more.
About Cryolite
Cryolite is a rare sodium aluminum fluoride mineral, Na3AlF6, historically significant as a flux in the industrial extraction of aluminum metal from bauxite ore. It is best known from a single massive deposit at Ivigtut, Greenland, which was, until its exhaustion, essentially the only commercially significant source on Earth. Its name comes from the Greek for "ice stone," reflecting its unusual property of becoming nearly invisible when submerged in water due to a refractive index close to that of water itself.
About Clear Quartz
Clear quartz, also known as rock crystal, is the purest form of quartz. It's been used for jewelry, carvings, and spiritual purposes throughout history.
Cryolite vs Clear Quartz FAQ
Is Cryolite the same as Clear Quartz?
No. Cryolite is a mineral while Clear Quartz is a quartz family. Clear Quartz is harder (Mohs 7) than Cryolite (Mohs 2.5–3), so Clear Quartz will scratch Cryolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not.
How can you tell Cryolite from Clear Quartz?
Clear Quartz is harder (Mohs 7) than Cryolite (Mohs 2.5–3), so Clear Quartz will scratch Cryolite and not the other way round. A copper coin (Mohs 3.5) scratches it, but a fingernail does not. Hold a thin edge to the light: Cryolite is Transparent to translucent, Clear Quartz is transparent. They overlap in clear, but Cryolite also comes in brown and red.
Which is harder, Cryolite or Clear Quartz?
Clear Quartz is harder: Mohs 7 against Mohs 2.5–3 for Cryolite.
Which is more valuable, Cryolite or Clear Quartz?
Clear Quartz is usually the more valuable of the two: a typical collector specimen runs about $25 against $20 for Cryolite, and premium Clear Quartz can reach $200 or more.
