Ocean Jasper
Silicon Dioxide (SiO2)
Mineral_variety_of_Chalcedony
Category
Mineral (Specifically A Mineraloid)
Browse mineral (specifically a mineraloid) specimens identified by the Rock Identifier community.
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Pink Granite
Phaneritic Felsic Igneous Rock
igneous
Obsidian
Obsidian (volcanic glass)
igneous
Gneiss
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Crushed Stone (Gravel/Aggregates)
Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)
sedimentary and igneous (mixed)
Granite
Felsic intrusive igneous rock
igneous
Sandstone
Clastic sedimentary rock (primarily SiO2)
sedimentary
Osumilite in Granite Matrix
(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Pegmatite (likely Granitic Pegmatite)
Pegmatite (a coarse-grained igneous rock, often with granitic composition)
igneous
Limonite (Ironstone Concretion)
Limonite (Hydrous Ferric Oxides mixed with Goethite)
sedimentary
Gneiss
Gneiss (a type of metamorphic rock)
Metamorphic Rock
Jewelry (Ring)
This image does not contain a rock, mineral, or geological specimen. The object in the image is a piece of jewelry, specifically a ring with a pentagram and what appears to be a red gem or stone set in the center.
Snowflake Obsidian
Volcanic Glass with Cristobalite inclusions
igneous
Greisen
Greisen
Metamorphic
Fulgurite
Fulgurite (Lechatelierite)
metamorphic
Fulgurite
Fulgurite (Lechatelierite-rich fused silica)
mineraloid / sedimentary (secondary formation)
Serpentinite (probable)
Serpentinite, dominated by serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with dark magnetite or chromite and pale carbonate/talc possible
metamorphic
Black Opal Ring (Carved Opal)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Anthracite Coal
Anthracite (Carbon-rich mineraloid)
metamorphic
Amber
Succiniferous fossil resin (C10H16O)
mineraloid
Opal (in Jewelry Setting)
Hydrated Silicon Dioxide (SiO2·nH2O)
gemstone
Polished orbicular granite (likely K2-type granite)
Granite, chiefly quartz, alkali feldspar, plagioclase, and dark amphibole/biotite; possible epidote-rich orbicules
igneous
Obsidian
Obsidian
igneous
Amber
Succinate (Fossilized Tree Resin)
mineraloid
Amber
Succinite (Fossilized Tree Resin)
mineraloid
Amber
Succinite (fossilized tree resin)
mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Amber
Succinrite (Organic Gemstone)
mineraloid
Amber
Succinite (a fossilized organic resin containing succinic acid)
mineraloid
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Amber
Succinite
Mineraloid
Amber
Succinite (approximate formula C10H16O)
mineraloid
Amber
Succinite (C10H16O)
mineraloid
Amber
Succinite (with approximate formula C10H16O)
mineraloid
Amber
Succinite (fossilized tree resin)
mineraloid
Amber
Succinite (Formula: C10H16O)
Mineraloid
Amber
Succinite (a variety of fossilized tree resin); chemical formula appx. C10H16O
mineraloid
Green Opal
Hydrated amorphous silica (SiO2·nH2O)
mineraloid
Sea Glass (often mistaken for Gemstones)
Amorphous Silica (SiO2) with trace additives
mineraloid
Pearl
Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin
mineraloid