Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Category
Industrial Byproduct (Often Mistaken For Obsidian Or Mineral)
Browse industrial byproduct (often mistaken for obsidian or mineral) specimens identified by the Rock Identifier community.
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Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Almandine Garnet
Almandite (Fe3Al2(SiO4)3)
Mineral
Jasper pebble
Jasper (Silicon Dioxide, SiO2)
sedimentary
Dyed Agate Slice
Silicon Dioxide (SiO2) with artificial colorants
Mineral (variety of Chalcedony)
Coal
Bituminous or Anthracite coal (carbon-rich sedimentary rock)
sedimentary
Fluorite (often referred to casually as 'Fluorspar' in industrial contexts)
Fluorite (CaF2)
Mineral
Limonite (Iron Ore)
Limonite (Hydrated iron oxide - FeO(OH)·nH2O)
mineral
Quartzite
Quartzite (primarily SiO2)
metamorphic
Limonite (also known as Yellow Ochre or Brown Hematite)
Limonite (Hydrated iron oxide-hydroxide, FeO(OH)·nH2O)
Mineral
Emerald
Beryl (Be₃Al₂Si₆O₁₈), specifically the green variety colored by trace amounts of chromium or vanadium.
Mineral
Granodiorite
Granodiorite (Na,Ca)(Al,Si)4O8
igneous
Talc
Talc (Mg₃Si₄O₁₀(OH)₂)
Mineral
Synthetic Costume Accessory (Non-Geological)
Polyester and Acrylic Fiber (Anthropogenic polymer)
Synthetic / Man-made textile
Tektite (Indochinite)
Tektite (High-silica natural glass, primarily SiO2 with Al2O3)
igneous
Milky Quartz
Silicon Dioxide (SiO2)
Mineral
Desert Rose Selenite (Gypsum)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
mineral
Quartzite
Quartzite
metamorphic
Druzy Quartz
Silicon Dioxide (SiO2)
mineral
Quartz on Feldspar
Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)
igneous
Jade (Jadeite/Nephrite)
NaAlSi2O6 (Jadeite) / Ca2(Mg,Fe)5Si8O22(OH)2 (Nephrite)
metamorphic
Quartzite Pebble
Quartzite (SiO2)
metamorphic
Quartzite
Silica (SiO2)
metamorphic
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N/A
Sodalite
Na8(Al6Si6O24)Cl2
mineral
Granitic Gravel Piece
Granite (Felsic Plutonic Rock / SiO2 with Al2O3, K2O, Na2O)
igneous
Diamond (appearing as a jewelry centerpiece)
Diamond (Formula: C)
mineral
Brachiopod Fossil in Limestone
Phylum Brachiopoda (likely Order Spiriferida), CaCO3 (Calcite)
sedimentary
Garnet (likely Almandine or Pyrope)
Garnet Group, Nesosilicates (Complex chemistry, e.g., Almandine: Fe3Al2Si3O12)
mineral
Quartzite (Milky or Cloudy Quartz variant)
Silicon Dioxide (SiO2)
metamorphic
Sea Glass (Turquoise/Aqua)
Amorphous Silica (SiO2) with transition metal dopants
Anthropogenic (Man-made material processed by nature)
Pet Rock (Man-made Quartzite or Granite Cobble)
Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica
igneous or metamorphic (base stone); anthropogenic (decoration)
Chert (and Flint)
Silicon Dioxide (SiO2)
sedimentary
Epidote
Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Diamond
Cubic carbon (C)
mineral
Diamond
Diamond (C)
mineral
Quartzite (River Pebble)
Metamorphic rock consisting primarily of Quartz (SiO2)
metamorphic
Green Calcite
Calcium Carbonate (CaCO3)
mineral
River/Stream Pebble
Clast / Detrital Grain / Rounded Sedimentary Particle (Compositionally variable, commonly Quartz, Feldspar, Chert, or other resistant rock fragments)
Mineral, specifically a rock fragment
Schist
Schist
Metamorphic
Diamond (in jewelry setting)
Adamantine Carbon (C)
mineral