Stones/Gems with F
Genuine mineral/gem; widely recognized.
Natural stone (a type of chert); real rock.
Major mineral group; includes gem varieties.
Old term for flint or pyrite; a real stone.
- fire opal
Ferrite is an iron oxide mineral phase.
Means a piece of flint; a real stone.
Flagstone is a type of flat sedimentary stone.
Fire quartz is quartz with red hematite inclusions.
- fossils
Trade name for red spinel or treated corundum.
Pyroxene variety from Fassa, Italy; rare gem.
Chalcedony with flower‑like patterns; new-age gem.
Green chromium‑rich mica mineral, minor gem
Concretion “fairy stones” (staurolite) used as charms
Olivine-group mineral; gem variety is peridot
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