Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Category
Man Made Composite (Lithified Equivalent Of Sedimentary)
Browse man made composite (lithified equivalent of sedimentary) specimens identified by the Rock Identifier community.
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Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)
Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.
Metamorphic, Mineral (within a rock type)
Quartz-rich pegmatite (likely feldspar–quartz rock)
Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining
igneous
Pegmatitic granite (likely feldspar–quartz–mica rock)
Granitic pegmatite; chiefly K-feldspar and quartz, with mica and iron-oxide staining
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Conglomerate
Conglomerate (a clastic sedimentary rock)
Sedimentary
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Red gemstone ring, likely garnet or synthetic ruby
Possibly almandine garnet (Fe₃Al₂(SiO₄)₃) or corundum/ruby (Al₂O₃); image alone cannot distinguish
gemstone
Quartz (vein quartz)
SiO2 (Silicon Dioxide)
Mineral
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Sandstone (Pebble/Cobble)
Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)
Sedimentary
Sandstone (with Iron Staining)
Clastic sedimentary rock (primarily SiO2 with Fe2O3)
sedimentary
Hematite
Hematite (Fe2O3)
mineral
Sandstone (Water-worn pebble)
Arenite (primarily SiO2)
sedimentary
Vesicular volcanic rock, likely weathered pumice or scoria
Pumice/scoria; predominantly volcanic glass and feldspar, with possible iron oxides
igneous
Diamond
Carbon (C)
gemstone
Diamond
Diamond (pure Carbon, C)
mineral
Quartzite
Metamorphic Quartzite
metamorphic
Gastly (Trick or Trade Halloween Series)
Cellulose-carbonaceous composite (Lignocellulose laminated with pigmentary polymers)
Mineral (Synthetic - Paper and Ink Polymorph)
Diamond (or Diamond Simulant)
Carbon (C) or Cubic Zirconia (ZrO2)
gemstone
Basalt
Basalt
igneous
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Granite
Granite (a plutonic igneous rock)
Igneous
Black Onyx
Cryptocrystalline Quartz (SiO2) with carbon/iron impurities
mineral/sedimentary
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
River Rock / Stream Pebble
Fluvial Clast / Rounded Sedimentary Particle
Sedimentary Rock (possibly composed of various minerals)
Ironstone (Limonitic Concretion)
Limonite (FeO(OH)·nH2O) with Goethite and Hematite inclusions
sedimentary
Diamond
Diamond (pure Carbon, C)
mineral
Diamond
C (Pure Carbon)
gemstone
Diamond
Carbon (C)
mineral
Basalt
Basalt (containing plagioclase, pyroxene, and olivine)
igneous
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Sea Shell Fragment (Calcium Carbonate)
Aragonite / Calcite (CaCO3)
mineral
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Sandstone
Arenite
sedimentary
Quartz (likely a weathered/tumbled piece)
Quartz (SiO₂)
Mineral
Siltstone / Slate
Siltstone / Low-grade Slate
sedimentary