Blue Opal Inlay (Simulated/Lab-created)
Hydrated Amorphous Silica (SiO2·nH2O) with polymer resin
mineraloid
Category
Organic Crystal (Mineraloid)
Browse organic crystal (mineraloid) specimens identified by the Rock Identifier community.
Blue Aragonite
Aragonite (Calcium Carbonate, CaCO3)
mineral
Granite
Felsic intrusive igneous rock
igneous
Granite
Granite
igneous
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Granitic Pegmatite (with Smoky Quartz and Mica)
Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))
igneous
Garnetiferous Pegmatite
Pegmatite with Almandine Garnet and Muscovite
igneous
Obsidian and Green Calcite
Volcanic Glass and Calcium Carbonate (CaCO3)
igneous and sedimentary/mineral
Granite Pegmatite with Muscovite Mica
Granite Pegmatite (Silicon Dioxide and complex silicates)
igneous
Aragonite
Aragonite (CaCO3)
mineral
Glass Nugget (Tumbled Glass)
Amorphous Silicon Dioxide (SiO2) with additives
mineraloid (man-made)
Quartzite
Quartzite (composed primarily of Quartz, SiO2)
metamorphic
Granitic Pegmatite with Tourmaline and Sphalerite
Pegmatite containing Schorl (NaFe3Al6(BO3)3Si6O18(OH)4) and Sphalerite ((Zn,Fe)S)
igneous
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Tanzanite (Rough)
Blue Zoisite (Ca2Al3(SiO4)3(OH))
mineral
Chert (White Variety)
Silicon Dioxide (SiO2)
sedimentary
Fuchsite Schist
K(Al,Cr)2(AlSi3O10)(OH)2 (Chromium-rich Muscovite)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Vein in Host Rock
Crystalline Silicon Dioxide (SiO2) in Igneous/Metamorphic Matrix
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Pegmatite
Igneous Pegmatite
igneous
Quartzite
Quartzite (SiO2)
metamorphic
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Quartzite
Metamorphosed Quartz Sandstone (SiO2)
metamorphic
Smoky Quartz Geode
Silicon Dioxide (SiO2)
mineral
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Fossilized Rugose Coral)
fossil
Granite (likely a river or beach pebble)
Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)
Igneous
Quartzite
Metamorphic Quartz Sandstone
metamorphic
Slag (Industrial Glass)
Artificial Vitreous Silicate
mineraloid (anthropogenic)
Kidney Stone
Nephrolithiasis (Calcium Oxalate, Hydroxyapatite, or Uric Acid)
mineral
Shungite
Non-crystalline carbon (C)
mineral
Granite
Granite (a plutonic igneous rock)
Igneous
Fossil Shark Tooth (Sand Tiger or Mackerel Shark)
Carcharias sp. or Otodus sp. replaced by Hydroxylapatite/Calcium Carbonate
sedimentary
Amber
Succinite (fossilized resin)
mineral
Slag Glass
Amorphous Silica Glass (with metal oxide inclusions)
Mineraloid / Industrial Waste
Chert (specifically Flint or Nodular Chert)
Silicon dioxide (SiO2)
sedimentary
Shungite
Non-crystalline carbon (Fullerene-bearing)
mineral
Dendritic Agate (Tree Agate)
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral
Fossil Bivalve / Ostreid Shell (Hag Stone / Perforated Pebble)
Phylum Mollusca, Class Bivalvia
fossil
Amber
Succinite (specifically for Baltic Amber), Formula: C10H16O
Organic Gemstone (often associated with Sedimentary sequences)
Fossiliferous Limestone
Carbonate Sedimentary Rock (primarily CaCO3)
sedimentary
Amber
Succinite (Fossilized Tree Resin)
gemstone