Wallboard/Drywall (Gypsum-based)
Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O
sedimentary
Category
Mineral Description (Anthropogenic Material)
Browse mineral description (anthropogenic material) specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
gemstone
Conglomerate (River Rock Aggregate)
Conglomerate (Lithic-clast conglomerate)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Mica Schist
Mica Schist (contains Muscovite, Biotite, and Quartz)
metamorphic
Milky quartz-bearing rock, possibly quartzite
Quartz (SiO₂), likely in a quartzite or quartz-rich metamorphic matrix
metamorphic
Pink Granite
Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)
igneous
Tumbled tiger’s-eye
Tiger’s-eye quartz, SiO₂ with fibrous crocidolite pseudomorphs
mineral
Tumbled chalcedony or carnelian
Microcrystalline quartz (SiO₂), likely iron-bearing chalcedony
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Carnelian Agate
Silicon Dioxide (SiO2)
mineral
Diamond
Natural Carbon (C)
mineral
Green Calcite (often commercially called Green Onyx)
Calcium Carbonate (CaCO3)
Mineral
Mica
Phyllosilicate (group name), typically Muscovite KAl2(AlSi3O10)(OH)2 or Biotite K(Mg,Fe)3(AlSi3O10)(OH)2
mineral
Blue Topaz (facetted in jewelry)
Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)
mineral
Tumbled jasper or chalcedony pebble
Microcrystalline quartz (SiO₂), likely jasper/chalcedony with iron-oxide staining
mineral
Carnelian Agate
Carnelian (Silicon Dioxide - SiO2 with Iron Oxide impurities)
Mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Rough Diamond
Native Carbon (C)
mineral
Diamond (Green tinted)
Carbon (C) with trace impurities or lattice defects
mineral
Diamond
Carbon (C)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Unakite
Unakite; epidote–pink feldspar–quartz rock
metamorphic
Sandstone (Ferruginous)
Arenite (primarily SiO2 with Fe2O3 cement)
sedimentary
Tumbled goldstone-like quartz pebble
Likely iron-stained quartz or jasper; exact identification requires testing
mineral
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Sandstone (Ferruginous)
Arenite (composed primarily of SiO2 with Fe2O3 cement)
sedimentary
Likely serpentinized ultramafic rock (serpentinite)
Serpentinite; chiefly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, possibly with magnetite, chromite, and brucite
metamorphic
Ferrochrome Slag
Calcium-Aluminium-Magnesium Silicate Slag
industrial byproduct
Engineer Quartz/Quartzite
SiO2 (Silicon Dioxide with binders)
Sedimentary or metamorphic-derived
Amygdaloidal basalt (vesicular basalt)
Basalt, commonly containing amygdales of quartz, chalcedony, calcite, or zeolites
igneous
Rounded quartz-rich beach pebble
Likely milky quartz or quartzite (SiO₂)
mineral
Milky Quartz with Mineral Inclusions
Silicon Dioxide (SiO2)
mineral
Weathered iron-rich rock, likely limonite-bearing sandstone or laterite
Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals
sedimentary
Basalt with Quartz/Feldspar Vein
Amygdaloidal Basalt with Plutonic intrusion (SiO2/KAlSi3O8)
igneous
Quartz Chip
Silicon Dioxide (SiO2)
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
mineralological
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Sandstone (likely with Borings or Vesicular Basalt)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Red Sandstone
Arenite (primarily Quartz with Hematite cement)
sedimentary
Olivine (Peridotite)
(Mg,Fe)2SiO4 (Magnesium Iron Silicate)
igneous