Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Category
Mineral Based Composite
Browse mineral based composite specimens identified by the Rock Identifier community.
Learn about Mineral Based Composite in the encyclopedia
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Soapstone (talc-rich schist)
Talc schist; chiefly hydrated magnesium silicate, Mg₃Si₄O₁₀(OH)₂
metamorphic
Polished turquoise cabochon
Turquoise, hydrous copper-aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Turquoise in Matrix
Hydrated copper aluminum phosphate, CuAl6(PO4)4(OH)8·4H2O
mineral
Tree Agate (or Moss Agate), faceted into a crystal tower
Dendritic Agate (Silicon Dioxide, SiO2)
Mineral
Polished turquoise
Turquoise — hydrated copper–aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O
gemstone
Granite Glacial Erratic
Intrusive Phaneritic Felsic Rock (Granite)
igneous
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite impurities
mineral
Basaltic Tuff / Volcanic Breccia
Pyroclastic Breccia / Lithic Tuff
igneous
Mookaite Jasper
Silicified Radiolarite (SiO2)
sedimentary
Sandstone
Arenite (SiO2 principal)
sedimentary
Small clear crystal, probably quartz
Quartz (SiO₂), possibly a tiny quartz chip or translucent feldspar fragment
mineral
Tumbled amethyst (tentative)
Amethyst, purple variety of quartz (SiO₂)
mineral
Amethyst
Amethyst (Silicon Dioxide with iron impurities), SiO2
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Cubic Zirconia (Faceted)
Zirconium Dioxide (ZrO2)
mineral
Banded Calcite (Mexican Onyx)
Calcite (Calcium Carbonate, CaCO3)
mineral
Milky quartz (rough quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Honey calcite (orange/yellow calcite)
Calcite — calcium carbonate, CaCO₃
mineral
Dark metamorphic rock, likely slate or phyllite
Foliated metapelite; commonly mica-rich quartz–clay mineral assemblage
metamorphic
Marble (Sculpted Statue)
Metamorphic Limestone (composed primarily of Calcite, CaCO3)
metamorphic
Synthetic Zinc/Polycarbonate Composite (Bey-specimen)
Zinc Alloy (Zamak 3) with Polycarbonate (C15H16O2)n Overlay
Anthropogenic Mineral Mimic
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Blue-green turquoise (probable)
Turquoise, hydrous copper aluminum phosphate — CuAl₆(PO₄)₄(OH)₈·4H₂O
mineral
Micro-Meteorite (Micrometeoroid)
Extraterrestrial Spherule (Silicate or Iron-Nickel)
mineral
Gold
Gold (Au)
mineral
Tumbled Carnelian and Quartz Mix
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Diamond
Native Carbon (C)
mineral
Gold Nugget
Native Gold (Au)
mineral
Gold Nugget
Native Gold (Au)
mineral
Silver (Jewelry Specimen)
Native Silver (Chemical Formula: Ag)
mineral
Red Sandstone (Siltstone pebble)
Arenite / Siltstone (Silicon dioxide based with hematite impurities)
sedimentary
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Banded Calcite
Calcium Carbonate (CaCO3)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Quartz (Clear/Smoky Geode fragment)
Silicon Dioxide (SiO2)
mineral
Yellow calcite crystal specimen
Calcite (CaCO₃), likely honey/yellow calcite
mineral
Emerald in Host Rock
Beryl (Be3Al2Si6O18) containing Chromium and/or Vanadium
mineral
Conglomerate
Conglomerate (Clastic Sedimentary Rock)
sedimentary
Magnetic Hematite
Iron(III) oxide (Fe2O3) - Man-magnetized ceramic/barium ferrite composite
mineral
Zebra Jasper
Tumbled Opaque Chalcedony (SiO2)
sedimentary