Quartz on Chlorite Schist
Chlorite Schist (Mg,Fe)3(Si,Al)4O10(OH)2 with Quartz (SiO2)
metamorphic
Category
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Browse this image does not display a rock, mineral, or geological specimen. it shows a human hand wearing a ring. specimens identified by the Rock Identifier community.
Anthracite Coal
Anthracite (Carbon-based sedimentary-metamorphic rock)
metamorphic
Diamond (Set in jewelry)
Cubic Carbon (C)
mineral
Anthracite Coal
Anthracite
metamorphic
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Banded Calcite (Mexican Onyx)
Calcite (CaCO3)
mineral
Jasper
Silicon dioxide (SiO2)
sedimentary
Dyed Blue Agate
Silicon Dioxide (SiO2)
Mineral
Aventurine Quartz
Silicon Dioxide (SiO2) with inclusions (typically Fuchsite/Mica)
metamorphic
Green Jade (specifically Nephrite)
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Corundum
Corundum (Aluminium oxide, Al2O3)
mineral
Chert (Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Quartzite with Dark Mineral Inclusions
Quartzite (primarily SiO2) with accessory minerals
metamorphic
Unakite
Unakite (Altered Granite consisting of Orthoclase KAlSi3O8, Epidote Ca2(Al,Fe)3(SiO4)3(OH), and Quartz SiO2)
metamorphic
Chert (Jasper/Carnelian variety)
Microcrystalline Quartz (SiO2)
sedimentary
Granite Cobble
Plutonic Granite
igneous
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert (Common Opal variant)
Silicon Dioxide (SiO2)
sedimentary
Tiger's Eye
Silicon dioxide (SiO2) with fibrous inclusions of crocidolite
Mineral
Limonite
FeO(OH)·nH2O (Hydrated iron oxide)
mineral
Turritella Agate
Silicified Elimia tenera Fossil (SiO2)
sedimentary
Amethyst (Agate/Chalcedony variety)
Silicon Dioxide (SiO2) with iron impurities
mineral
Quartzite (Lithic Artifact)
Quartzite (SiO2)
metamorphic
Coquina
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Granite Cobble
Felsic Intrusive Igneous Rock (composed of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Amazonite
Amazonite (KAlSi3O8, a variety of Microcline)
mineral
Gold Ore
Native Gold in Quartz (Au)
mineral
Peridot
Olivine ((Mg, Fe)2SiO4)
Mineral
Gold Nugget / Flake
Native Gold (Au)
mineral
Milky and Smoky Quartz Cobble
Silicon Dioxide (SiO2)
mineral
Shell Cameo
Cypraecassis rufa (Bullmouth Queen Helmet Shell)
mineraloid / biogenic specimen
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Copper-bearing Quartz (with Malachite and Iron Oxides)
Quartz (SiO2) with Malachite (Cu2CO3(OH)2) and Hematite/Limonite (Fe2O3)
Mineral Specimen
Jasper
Silicon Dioxide (SiO2)
sedimentary
Amethyst (Chevron or Banded Amethyst)
Silicon Dioxide (SiO2 with iron impurities)
Mineral
Basalt Pebble with Epidote/Olivine
Vitreous Basalt (SiO2 with Ca/Mg/Fe silicates)
igneous
Gold
Native Gold (Au)
Mineral
Biological Bone (Patella/Knee)
Patella (part of the Human Skeletal System)
Organic Structure (Not a Rock)
Agate (specifically Moss or Plume Agate nodding toward Agatized Wood)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz (Chalcedony)
mineral
Chert (Jasper and Chalcedony)
Silicon Dioxide (SiO2)
sedimentary
River Cobble (likely Quartzite or Limestone)
SiO2 (Quartzite dominant) or CaCO3 (Limestone dominant)
metamorphic or sedimentary
Moonstone
Orthoclase (Potassium aluminum silicate - KAlSi3O8)
mineral