Mahogany Obsidian
Volcanic Glass (SiO2 with Fe/Mg oxides)
igneous
Category
Mineral (Or Mineraloid If Microcrystalline)
Browse mineral (or mineraloid if microcrystalline) specimens identified by the Rock Identifier community.
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Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Black Obsidian
Volcanic glass (Amorphous silicates)
igneous
Shungite
Carbon-rich mineraloid (Amorphous carbon)
mineral
Green Opal
Hydrated amorphous silica (SiO2·nH2O) with inclusions
mineraloid
Sea Glass (Frosted Quartz/Glass)
Amorphous Silicon Dioxide (SiO2)
Mineraloid
Amber
Succinurite (C10H16O)
mineraloid
Snowflake Obsidian
Volcanic glass (SiO2 - Silicon Dioxide with Cristobalite inclusions)
igneous
Cullet Glass (Slag Glass)
Amorphous Silicon Dioxide (Industrial byproduct)
mineraloid
Obsidian
Obsidian (principally SiO2 with MgO and Fe3O4)
igneous
Amber
Succinite (specifically for Baltic amber); C10H16O (Variable organic compound)
mineral
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber with Inclusion
Succiniferous fossil resin (C10H16O)
mineraloid
Pearl
Calcium Carbonate (Aragonite/Calcite mixed with Conchiolin), CaCO3
mineral
Mahogany Obsidian
Volcanic glass (SiO2 + Fe2O3)
igneous
Opalite
Synthetic glass (SiO2 + metal additions)
mineraloid
Obsidian
Volcanic Glass (Amorphous silicon dioxide with trace impurities)
igneous
Snowflake Obsidian
Obsidian with Spherulitic Cristobalite (SiO2)
igneous
Green Opal (Prase Opal)
SiO2 · nH2O (Hydrated Silicon Dioxide)
mineral
Pink Opal
Hydrated Silica (SiO2·nH2O) with Palygorskite inclusions
Mineraloid
Snowflake Obsidian
Volcanic glass containing Spherulites (SiO2)
igneous
Pearl (Biogenic Mineraloid)
Calcium carbonate (Aragonite) and Conchiolin, CaCO3
mineral
Precious Opal
Hydrated Silica (SiO2·nH2O)
mineral
Pearl (Cultured or Natural)
Aragonite (CaCO3) with Conchiolin
Organic Mineraloid
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
mineral
Yellow Jasper
Jasper (Silicon Dioxide, SiO2)
sedimentary (or mineraloid)
Yellow Chalcedony (common opal or chert variant)
Silicon Dioxide (SiO2)
sedimentary (mineraloid/microcrystalline quartz)
Amber
Amber (Fossilized Tree Resin)
Mineral
Jade (likely Jadeite or Nephrite)
Jadeite (NaAlSi2O6) or Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2)
Mineral/Mineraloid
Tektite (likely Australite)
Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)
Mineral (specifically a mineraloid)
Jade
Jadeite or Nephrite
Mineral/Mineraloid
Polished black stone egg, probably black obsidian
Obsidian, a natural volcanic glass; composition primarily silica-rich glass (approximately SiO₂), with variable iron and other trace elements
gemstone
Amber
Succinate (Succinite for Baltic varieties)
Organic Mineraloid
Red Coral
Corallium rubrum (Calcium Carbonate, CaCO3 with Carotenoid pigments)
Mineraloid (Organic Gemstone)
Amber
Succinite (fossilized tree resin)
Organic Mineraloid
Amber
Succinite
Organic Mineraloid
Amber
Succinite (with empirical formula approximately C10H16O)
Organic Mineraloid
Ceramic or Polished Stone Heart (Anthropogenic Material)
Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)
Synthetic/Anthropogenic Mineraloid
Amber
Succinite (formula varies, primarily C10H16O)
Mineraloid (Organic)
Amber
Succinite (specifically Baltic Amber) - Formula: C10H16O (approximate)
Organic Mineraloid
Amber
Succinite (specifically for Baltic amber); approximate formula C10H16O
organic mineraloid
Amber
Succinite
Organic mineraloid