Carnelian Agate
Carnelian (Silicon Dioxide - SiO2 with Iron Oxide impurities)
Mineral
Category
Organic Gemstone (Sedimentary Classification)
Browse organic gemstone (sedimentary classification) specimens identified by the Rock Identifier community.
Fluorite Bracelet (light green beads) and possibly Lavender Jadeite (purple bead)
Fluorite: CaF₂ (Calcium Fluoride); Jadeite: NaAlSi₂O₆ (Sodium Aluminum Silicate)
Mineral for Fluorite; Mineral/Rock for Jadeite (as it's often a rock composed primarily of jadeite mineral)
Turquoise
Hydrated phosphate of copper and aluminum (CuAl6(PO4)4(OH)8·4H2O)
mineral
Moonstone (Feldspar variety)
Orthoclase Feldspar (KAlSi3O8)
mineral
Lapis Lazuli
Na6Ca2(Al6Si6O24)(SO4,S,Cl,OH)2 (Lazurite-dominated rock)
metamorphic
Tiger's Eye
Pseudomorph of Quartz after Crocidolite (SiO2)
mineral
Sandstone
Clastic Sedimentary Rock (composed mostly of SiO2)
sedimentary
Serpentine
Antigorite, Lizardite, or Chrysotile (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Serpentine (variety: Serpentine Rock)
Antigorite, Lizardite, or Chrysotile; formula generally (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4
metamorphic
Rhodonite
Rhodonite (Manganese Silicate), (Mn,Fe,Mg,Ca)SiO3
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Rhodonite
Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn+2,Fe+2,Mg,Ca)SiO3
mineral
Aquamarine with Ruby Accent
Beryllium Aluminum Silicate (Be3Al2Si6O18) with Aluminum Oxide (Al2O3)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Connemara Marble
Ophiocalcite (Serpentinitic Marble)
metamorphic
Quartz
Quartz (SiO2)
Mineral
Peridot
Olivine (Magnesium Iron Silicate - (Mg, Fe)2SiO4)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Shale
Fissile Siliciclastic Sedimentary Rock
sedimentary
Aquamarine
Beryl (Be3Al2Si6O18)
mineral
Blue Howlite (Dyed)
Calcium Borosilicate Hydroxide (Ca2B5SiO9(OH)5)
mineral
Orange Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Jadeite Jade
NaAlSi2O6 (Sodium Aluminum Silicate)
metamorphic
Rough Gemstone Grains (Mixed Sapphires and Quartz)
Corundum (Al2O3) and Quartz (SiO2)
mineral
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Olivine
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
mineral
Quartz
Quartz (SiO₂)
Mineral
Chert
Silicon dioxide (SiO2)
sedimentary
Olivine in Basalt (Peridot)
Magnesium Iron Silicate (Mg,Fe)2SiO4 (Mineral) within Basalt (Rock)
igneous
Kunzite (Pink Spodumene)
Spodumene, LiAl(SiO3)2
mineral
Quartz (various varieties)
SiO₂ (Silicon Dioxide)
Mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Yellow Quartz or Citrine
Silicon Dioxide (SiO2)
mineral
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2 with impurities of iron)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral