Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Category
Mineral (Silicate Variety)
Browse mineral (silicate variety) specimens identified by the Rock Identifier community.
Emerald
Beryl (Be3Al2Si6O18), specifically the green variety colored by chromium or vanadium
Mineral (Gemstone variety of Beryl)
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Green Aventurine (likely)
Silicon dioxide (SiO2) with fuchsitemica inclusions
Mineral (specifically a variety of Quartz)
Smoky Quartz
SiO2 (Silicon Dioxide)
mineral
Moss Agate
Silicon Dioxide (SiO2) with inclusions of manganese or iron oxides
Mineral (Variety of Chalcedony)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Sandstone (lithic wacke)
Arenite / Lithic Wacke (mostly SiO2 with rock fragments)
sedimentary
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
Sandstone (Muddy/Silty Variety)
Arenite with high silt/clay content (clastic sedimentary rock)
sedimentary
Chert (often called Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Limonite Concretion (Ironstone)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite
sedimentary
Quartz
Quartz (Silicon Dioxide - SiO2)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral
Chert (or Flint)
Silicon dioxide (SiO2)
sedimentary
Basalt with Vesicles
Vesicular Basalt (comprising Plagioclase Feldspar, Pyroxene, and Olivine)
igneous
Jade (likely Nephrite Jade based on appearance)
Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral
Demantoid Garnet on Matrix
Demantoid (variety of Andradite Garnet) - Ca3(Fe3+)2(SiO4)3
mineral
Chert (variations include Flint/Jasper)
Chert (Silicon Dioxide, SiO2)
sedimentary
Rutilated Quartz
Quartz (SiO2) with Rutile inclusions (TiO2)
Mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Turquoise
Hydrous phosphate of copper and aluminium - CuAl6(PO4)4(OH)8·4H2O
mineral
Obsidian
Volcanic Glass (SiO2 - Silicon Dioxide with impurities)
igneous
Sandstone (with possibly iron oxides and other minerals)
Sandstone
Sedimentary rock
Schist
Mica Schist (variety: Muscovite/Biotite Schist)
metamorphic
BROWN GRANITE (likely 'Tan Brown' or similar)
Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)
igneous
Citrine Quartz
Silicon Dioxide (SiO2) - Ferric Iron impurities
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Vesicular Basalt (commonly mistaken for Slag)
Scoriaceous Basalt (composed primarily of Plagioclase Feldspar and Pyroxene)
igneous
Tree Agate
Silicon Dioxide with Chlorite inclusions (SiO2)
Mineral (Variety of Chalcedony)
Obsidian
Volcanic Glass (SiO2 rich)
igneous
Chert (variant of Flint)
Chert (SiO2)
Sedimentary
Chert (Flint)
Chert (predominantly SiO₂ - silicon dioxide)
sedimentary
Rough Green Beryl (Emerald variety)
Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)
mineral
Quartz (Smoky/Milky variety with matrix)
Silicon Dioxide (SiO2)
mineral
Aragonite (Star Cluster or Twinned variety)
Aragonite (Calcium Carbonate, CaCO3)
mineral
Amethyst (Chevron or Dream Amethyst variety)
Tectosilicate Silicon Dioxide (SiO2) with iron impurities
mineral
Quartz (Milky/Smoky variety on matrix)
Silicon Dioxide (SiO2)
mineral
Green Aventurine (Propably a tumbled variety)
Aventurine Quartz (SiO2 with inclusions of Fuchsite)
mineral