Fluorite
JewelryWiki Editorial·4 sources·Reviewed 2026-08-04
Defines point 4 on the Mohs scale, with perfect cleavage in four directions — a collector's stone rather than a jewellery one.
Properties
| Property | Value | Authority |
|---|---|---|
| Mohs hardness | 4 [4] | — |
| Refractive index | 1.434 [1] | — |
| Specific gravity | 3.00–3.25 [1] | — |
| Chemical formula | CaF2 [4] | — |
| Crystal system | Cubic [2] | — |
| Care cautions | NEVER use an ultrasonic cleaner — GIA names this among the gems susceptible to heat and temperature change, which should be kept out of an ultrasonic REGARDLESS of whether they have been treated. Use warm soapy water or a solution formulated for delicate gems. [3] | — |
Sources
- International Gem Society — reference charts (Mohs hardness, specific gravity, refractive index) — International Gem Society (IGS reference charts)
- Wikipedia — mineral article infoboxes (crystal system) — Wikipedia contributors (Wikipedia mineral infoboxes)
- GIA — Ultrasonic Cleaners for Gems: What You Need to Know — Gemological Institute of America (GIA 4Cs, Ultrasonic Cleaners for Gems)
- Handbook of Mineralogy — Mineral Data Publishing / Mineralogical Society of America (Handbook of Mineralogy, Mineral Data Publishing)