Quartz with Iron Staining
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
mineral
Category
Sedimentary Like (Industrial Composite)
Browse sedimentary like (industrial composite) specimens identified by the Rock Identifier community.
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Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Almandine Garnet
Almandine - Fe3Al2(SiO4)3
mineral
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
sedimentary/mineral
Brown Sandstone
Arenite (primarily Quartz and Feldspar, with Iron Oxide cement)
sedimentary
Blue Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Quartz (likely Herkimer Diamond style)
Silicon Dioxide (SiO2)
mineral
Yellow Sapphire
Corundum (Al2O3 with trace amounts of iron)
gemstone
Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Arsenopyrite with Quartz
Arsenopyrite (FeAsS)
mineral
White Quartz (Milky Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (likely Milky Quartz)
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite Pebble
Quartzite (primarily SiO2)
metamorphic
Ruby and Diamond Heart Pendant
Corundum (Al2O3) and Diamond (C)
mineral
Green Slag Glass
Amorphous Silica Glass (Anthropogenic)
Industrial byproduct (often mistaken for obsidian or mineral)
Calcite (likely honey/orange calcite)
Calcite — calcium carbonate, CaCO₃
mineral
Piddock-bored Mudstone
Lutite (Siltstone or Mudstone) with Pholad borings
sedimentary
Quartzite
Metamorphic Quartz-rich Rock
metamorphic
Basalt
Basalt
igneous
Bouncy Ball (Synthetic Rubber Polymer)
Polybutadiene / Ethylene Vinyl Acetate (EVA)
Synthetic material (Not a rock or mineral)
Schist
Mica Schist
metamorphic
Quartz (Water-worn pebble)
Silicon Dioxide (SiO2)
mineral
Yellow Calcite
Calcite (Calcium Carbonate, CaCO3)
mineral
Granodiorite
Granodiorite
igneous
Peridot (Olivine)
Magnesium Iron Silicate (Mg,Fe)2SiO4
mineral
Fulonite (Fulgurite-like)
Fulgurite (SiO2 fused silica/lechatelierite)
Metamorphic (Pseudo-igneous)
Apatite
Apatite group mineral (e.g., Fluorapatite - Ca5(PO4)3F, Chlorapatite - Ca5(PO4)3Cl, Hydroxylapatite - Ca5(PO4)3(OH))
mineral
Coal
Anthracite or Bituminous Coal (Carbon)
sedimentary
Coal (likely Bituminous or Lignite)
Organic Sedimentary Rock (Carbonaceous)
sedimentary
Diamond
Carbon (C)
mineral
Pumice
Pumice (a vesicular volcanic glass)
igneous
Blue Slag Glass
Man-made Silicon Dioxide (Amorphous)
Anthropogenic (Man-made)
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural radiation
mineral
Garnet
Garnet Group (formula varies, e.g., Almasndine: Fe3Al2(SiO4)3)
mineral
Coral Fossil
Anthozoa (Scleractinia)
fossil
Quartz Druzy (Geode Fragment)
Silicon Dioxide (SiO2)
mineral
Rough Garnet (likely Almandine or Pyrope)
Garnet group; Almandine Fe3Al2(SiO4)3 or Pyrope Mg3Al2(SiO4)3
mineral
Pegmatite (with smoky quartz and tourmaline/biotite)
Pegmatitic Granite
igneous