Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Category
Mineral (Gemstone)
Browse mineral (gemstone) specimens identified by the Rock Identifier community.
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Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Likely garnet crystal fragment
Garnet-group mineral, possibly almandine (Fe₃Al₂(SiO₄)₃)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz Crystal Cluster in Matrix
Silicon Dioxide (SiO2)
mineral
Likely garnet, possibly almandine
Garnet group; likely almandine, Fe₃Al₂(SiO₄)₃
mineral
Quartz (Small Grains)
Silicon Dioxide (SiO2)
mineral
Quartz on Host Rock
Silicon Dioxide (SiO2)
mineral
Quartz
Silicon dioxide (SiO2)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Pink Quartz
Silicon Dioxide (SiO2)
mineral
Polished red garnet (likely almandine)
Almandine garnet, Fe₃Al₂(SiO₄)₃; identification from the photo is provisional
gemstone
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Turquoise (Dyed Howlite or Magnesite imitation)
Hydrated phosphate of copper and aluminum / CuAl6(PO4)4(OH)8·4H2O
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Faceted Gemstone
Unknown transparent mineral, possibly Diamond (C), Cubic Zirconia (ZrO2), Quartz (SiO2), or Glass
gemstone
Cubic Zirconia (CZ)
Zirconium dioxide (ZrO2)
mineral
Amber
Fossilized tree resin (Amorphous organic polymer)
gemstone
Olivine (Peridot)
(Mg,Fe)2SiO4
mineral
Turquoise and Red Coral (with Grizzly Bear Claw)
Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Precious Coral (Corallium rubrum)
mineral
Blue Zircon
Zircon (Zirconium Silicate - ZrSiO4)
gemstone
Jasper
Silicon dioxide (SiO2)
Mineral / Sedimentary
Unidentified dark, flat specimen
Indeterminate; image resolution is insufficient for mineral identification
mineral
Polished leopard-skin jasper (likely feldspar-rich decorative stone)
Trade name: leopard-skin jasper; appearance may also fit a feldspar-rich rock such as larvikite or gabbro
metamorphic
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Quartz
Silicon dioxide (SiO2)
Mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Green Jasper
Microcrystalline Quartz (SiO2) with mineral inclusions
sedimentary
Turquoise
CuAl6(PO4)4(OH)8·4H2O
mineral
Amethyst
Silicon dioxide (SiO2)
mineral
Mixed Mineral Collection
Multi-mineral Assemblage (Quartz, Jasper, Obsidian, Pyrite, etc.)
mineral
Tiger's Eye (Brown/Golden)
Silicon dioxide (Quartz pseudomorph after crocidolite), SiO2
mineral
Rhodochrosite
Manganese Carbonate (MnCO3)
mineral
Pegmatitic granite (likely quartz–feldspar rock)
Granitic pegmatite, composed mainly of quartz (SiO₂) and feldspar
igneous
Tiger's Eye
Silicon Dioxide (SiO2) with fibrous inclusions
mineral
Potassium Feldspar
Orthoclase (KAlSi3O8)
mineral
Blue Apatite
Apatite (Ca5(PO4)3(F,Cl,OH))
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz (Yellow/Citrine Variety)
Silicon Dioxide (SiO2)
mineral
Garnet
Garnet Group (Silicate Minerals)
mineral
Amazonite
K(AlSi3O8) - Microcline
mineral
Unidentified polished mineral specimen
Indeterminate; likely a pale feldspar or quartz-bearing material
mineral