Diamond (in Jewelry)
Carbon (C)
mineral
Category
Man Made Composite
Browse man made composite specimens identified by the Rock Identifier community.
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Diamond
Carbon (C)
mineral
Sandstone
Arenite (composed primarily of SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Sandstone
Arenite (SiO2, often with CaCO3 or Fe2O3 cement)
sedimentary
White quartz geode
Quartz geode; predominantly microcrystalline and drusy SiO₂
mineral
Chalk
Micrite (primarily Calcium Carbonate or CaCO3)
sedimentary
Sandstone
Arenite (typically composed of SiO2)
sedimentary
Botryoidal chalcedony with iron-oxide staining
Microcrystalline quartz (SiO₂), likely iron-oxide-bearing chalcedony
mineral
Diamond
Diamond (pure carbon C)
mineral
Pearl
Organic gemstone (Calcium carbonate - CaCO3)
mineral
Chert (variations include Flint)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Likely tumbled epidote-bearing rock or green jasper
Epidote-group silicate, possibly in a jasper or serpentinite matrix
mineral
Quartzite
Metamorphic Quartz Rock (SiO2)
metamorphic
Red Quartzite
Quartzite (Metamorphosed Quartz Arenite)
metamorphic
Diamond
Carbon (C)
mineral
Diamond
Carbon (C)
gemstone
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Sandstone (SiO2 dominated)
sedimentary
Coal (Bituminous Coal)
Caustobiolith / Sedimentary Rock
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Quartzite
Metamorphic Quartzite (primarily SiO2)
metamorphic
Sandstone
Arenite
sedimentary
Diamond
Carbon (C)
gemstone
Sandstone
Clastic Sedimentary Rock
sedimentary
Diamond (or Cubic Zirconia)
Carbon (C) or Zirconium Dioxide (ZrO2)
gemstone
Quartzite
Metamorphic Quartzite
metamorphic
Fossilized Shell in Limestone
Biogenic Limestone (Calcium Carbonate, CaCO3)
sedimentary
Sandstone (Quartzose)
Arenite (primarily SiO2)
sedimentary
Diamond in Kimberlite
Diamond in Kimberlite Matrix (Diamond: C, Kimberlite: complex Potassic Peridotite)
igneous
Tumbled epidote-bearing rock (likely epidote–quartz–feldspar aggregate)
Epidote-rich metamorphic rock; minerals likely epidote (Ca₂(Al,Fe)₃Si₃O₁₂(OH), quartz, feldspar, and dark amphibole/biotite)
metamorphic
Diamond
Diamond (pure Carbon, C)
mineral
Basalt
Basalt (Mafic volcanic rock)
igneous
Chert (varietal: Flint/Jasper)
Silicon Dioxide (SiO2)
sedimentary
Quartzite
Quartzite (Metamorphosed Sandstone)
metamorphic
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic