Snowflake Obsidian
Spherulitic Obsidian (Amorphous Volcanic Glass with Cristobalite inclusions)
igneous
Category
Mineral Like Byproduct
Browse mineral like byproduct specimens identified by the Rock Identifier community.
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Dendritic Agate (also known as Dendritic Siltstone or Mudstone)
Silicon Dioxide with Manganese/Iron Oxide inclusions (SiO2 + MnO2)
sedimentary
Quartz vein in metamorphic rock
Crystalline Silicon Dioxide (SiO2) in Host Rock
metamorphic
Amber
Succinite (specifically for Baltic amber); chemical formula approx. C10H16O
Organic Gemstone (fossilized resin)
Obsidian
Obsidian (Volcanic glass, primarily SiO2)
igneous
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
mineral
Emerald
Beryl (Be3Al2(SiO3)6)
gemstone
Schist
Schist (Crystalline Metamorphic Rock)
metamorphic
Green Quartz
Silicon Dioxide (SiO2)
mineral
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly Zeolite, Calcite, or Quartz)
igneous
Blue Quartzite (Dyed)
Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)
metamorphic
Green Gneiss
Metamorphic Gneiss
metamorphic
Conglomerate
Clastic Sedimentary Conglomerate (SiO2 primarily)
sedimentary
Quartz Vein in Host Rock
Silicon Dioxide (SiO2)
mineral with metamorphic or sedimentary host
Granite
Felsic intrusive igneous rock
igneous
Granite
Phaneritic Igneous Rock (Granite)
igneous
Gneiss
Foliated Metamorphic Rock
metamorphic
Pink Granite
Phaneritic intrusive igneous rock (high Orthoclase Feldspar content)
igneous
Greenstone
Metabasalt / Chlorite-Epidote Schist
metamorphic
Granite
Felsic Plutonic Rock
igneous
Rough Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Chalcedony (Botryoidal)
Silicon Dioxide (SiO2)
mineral
Granite
Phaneritic Felsic Igneous Rock
igneous
Gabbro or Diorite with Quartz/Epidote Vein
Intrusive Igneous Rock (Plutonic)
igneous
Bumblebee Jasper
Anhydrite-Aragonite mixture with Orpiment and Realgar
mineraloid
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Apatite
Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Petrified Wood
Silicified Wood (primarily SiO₂ / Silicon Dioxide)
mineral
Specular Hematite
Specularite (Iron Oxide, Fe2O3)
mineral
Red Jasper
Red Jasper (SiO2 with Hematite inclusions)
mineral
Muscovite Mica
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Dendritic Opal
Hydrated Silica (SiO2·nH2O) with Manganese or Iron Oxide inclusions
mineral
Rutilated Quartz
Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions
mineral
Banded Gneiss (Variety of Gneiss)
Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)
Metamorphic Rock
Fluorite
Calcium Fluoride (CaF2)
mineral
Milky Quartz with Iron Oxide
Quartz (Silicon Dioxide, SiO2) with Limonite/Goethite staining
mineral
Arsenopyrite in Quartz/Host Rock
Arsenopyrite (FeAsS)
mineral
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Red Sandstone
Arenite (Ferruginous Sandstone)
sedimentary
Sandstone Cobble
Arenite (Sandstone)
sedimentary