Diamond
Native Carbon (C)
mineral
Category
Biogenic Material
Browse biogenic material specimens identified by the Rock Identifier community.
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Petrified Wood
Silicified Wood (SiO2)
sedimentary
Ocean Jasper Mushroom
Orbicular Jasper (Silicon Dioxide, SiO2 mixed with various impurities)
mineral
Breccia
Clastic Breccia (General mineral composition depends on fragments, often SiO2 or CaCO3)
sedimentary
Petrified Wood
Silicified Wood (primarily SiO2)
sedimentary
Quartz (Milky or Cloudy Quartz)
Quartz (Silicon Dioxide, SiO2)
mineral
Bivalve Shell (Fossil or Contemporary)
Class Bivalvie (various genera and species of clams, cockles, etc.)
Sedimentary (Biogenic sediment or biological remain)
Slate
Slate (foliated metamorphic rock, primarily composed of quartz, illite, chlorite, and micas)
metamorphic
Jasper
Silicon Dioxide (Microcrystalline Quartz), SiO2
sedimentary
Chert (Flint)
SiO2 (Microcrystalline Quartz)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Tumbled orange chalcedony (likely carnelian)
Carnelian, a cryptocrystalline variety of quartz (SiO₂)
gemstone
Tiger’s eye
Chatoyant quartz (fibrous quartz pseudomorph after crocidolite), SiO₂
gemstone
Blue chalcedony (likely dyed or polished)
Chalcedony, microcrystalline quartz (SiO₂)
mineral
Polished orbicular granite
Granite, chiefly quartz, alkali feldspar, plagioclase, and biotite/amphibole
igneous
Mixed rock and mineral collection
Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks
igneous, sedimentary, metamorphic, mineral
Dalmatian jasper
Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions
igneous
Tumbled amethyst
Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation
mineral
Pegmatite with quartz, feldspar, mica, and tourmaline
Granitic pegmatite; chiefly quartz (SiO₂), feldspar, muscovite, and black schorl tourmaline (NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)
igneous
Chalcedony (gray-white agate)
Microcrystalline quartz, SiO₂
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Granitic Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Greenstone
Metamorphic mafic rock (chlorite-actinolite-epidote schist)
metamorphic
Quartz-rich metamorphic rock (likely mica schist or gneiss)
Quartz–feldspar–mica assemblage; probable biotite schist/gneiss
metamorphic
Flint (or Chert)
Silicon dioxide (SiO2) microcrystalline quartz
sedimentary
Chert (Flint)
Microcrystalline quartz (SiO2)
sedimentary
Flint / Chert
Microcrystalline quartz (SiO2)
sedimentary
Unknown white fragment
Unknown
unknown
Gneiss
Orthogneiss / Paragneiss
metamorphic
Titanium Quartz (Aura Quartz)
Silicon Dioxide (SiO2) treated with Titanium
mineral
Chert (Flint / Jasper variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Dyed Crackle Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Chert / Flint
Microcrystalline quartz (SiO2)
sedimentary
Fossilized Shell Impression / Siltstone Fossil
Bivalvia / Brachiopoda mold in Siltstone
fossil
Diamond (faceted)
Carbon (C)
gemstone
Chert (specifically Cryptocrystalline Quartz)
Silicon dioxide (SiO2)
sedimentary
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Chert
Microcrystalline Quartz (SiO2)
sedimentary
Diamond (or Cubic Zirconia simulant)
C (Carbon) or ZrO2 (Zirconium Dioxide)
gemstone