Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
Category
Browse sedimentary (primary) with artificial modification specimens identified by the Rock Identifier community.
Amethyst
Amethyst (Silicon Dioxide - SiO2 with Iron impurities)
Slickenside
Tectonic Fault Scarp Surface
Porphyritic Rhyolite (Red Porp)
Porphyritic Rhyolite (Felsic volcanic rock)
Granodiorite
Granodiorite (Phaneritic intrusive igneous rock containing Plagioclase, Quartz, and Biotite/Amphibole)
Cinnabar
Mercury(II) sulfide (HgS)
Tanzanite
Blue Zoisite (Ca2Al3(SiO4)(Si2O7)O(OH))
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
Turquoise (likely stabilized or Howlite/Magnesite imitation)
Hydrated phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O
Beryl (Aquamarine) in Matrix
Beryllium aluminum silicate (Be3Al2(SiO3)6)
Arsenopyrite with Quartz
Arsenopyrite (FeAsS)
Pegmatite
Granitic Pegmatite
Blue Sapphire
Corundum (Al2O3 - Aluminum Oxide)
Granite
Granite (Felsic Plutonic Rock)
Blue Sapphire
Corundum (Al2O3)
Decomposed Granite
Grano-diorite/Granite-residuum (SiO2 primary)
Lapis Lazuli (in Matrix)
Na8[Al6Si6O24]S2 (Lazurite as the primary component)
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO₂)
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
Quartzite
Quartzite (Primary mineral: Silicon Dioxide, SiO2)
Red Jasper (with Quartz Veins)
Jasper (var. chert, SiO₂)
Granite (Background) and Quartzite/River Pebble (Foreground Heart)
Phaneritic Felsic Igneous Rock (Granite background)
Quartz Pebble
Silicon Dioxide (SiO2)
Green Aventurine
Silicon Dioxide (SiO2) with inclusions of Fuchsite
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
Milky Quartz
Silicon Dioxide (SiO2)
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)
Fluorite (CaF2)
Amazonite
K(AlSi3O8), Microcline (potassium feldspar)
Granite
Phaneritic Intrusive Igneous Rock (primarily composed of SiO2, Al2O3, K2O, Na2O)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Basalt
Mafic extrusive volcanic rock (composed primarily of Plagioclase feldspar and Pyroxene)
Gold
Gold (Au)
Granite (Pink/Red variety)
Phaneritic Felsic Intrusive Igneous Rock (composed primarily of Quartz, K-Feldspar, and Plagioclase)
Specular Hematite
Hematite (Iron Oxide, Fe2O3)
Lepidolite on Pegmatite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
Emerald in Matrix
Beryl (Be3Al2Si6O18) containing Chromium/Vanadium impurities
Blue Sapphire
Corundum (Al2O3 with trace amounts of iron and titanium)
Diamond
Diamond (Pure Carbon, C)
Quartz Vein Rock
Silicon Dioxide (SiO2)
Basalt (Vesicular/Amygdaloidal or Water-Worn)
Basalt
Magnetite with Pyrite or Chalcopyrite inclusions
Magnetite (Fe3O4) with Pyrite (FeS2)