Chondrite Meteorite
Ordinary Chondrite (S-type asteroid origin)
igneous
Category
Metamorphic (Modified)
Browse metamorphic (modified) specimens identified by the Rock Identifier community.
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Amethyst-bearing quartz
Quartz, SiO₂, with purple amethyst zoning and likely white milky quartz
mineral
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral
Citrine quartz crystal
Quartz, silicon dioxide (SiO₂); yellow variety commonly called citrine
mineral
Honey calcite crystal
Calcite (calcium carbonate, CaCO₃)
mineral
Aquamarine cabochon ring
Aquamarine, blue variety of beryl (Be₃Al₂Si₆O₁₈)
gemstone
Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Chert (Flint) with Patina
Microcrystalline Quartz (SiO2)
sedimentary
Bixbyite on Rhyolite
Bixbyite (Mn2+,Fe3+)2O3
mineral
Amethyst chip or polished fragment
Quartz, purple variety (SiO₂), likely mounted or attached to metal
gemstone
Banded calcite crystal tower
Calcite (CaCO₃), likely honey or brown banded calcite
mineral
Biotite-bearing granite or granitic gneiss
Granite/granitic gneiss, chiefly quartz, feldspar, and biotite mica, with possible epidote or chlorite alteration
igneous
Chert (Yellow or Tan Chert)
Silicon Dioxide (SiO2)
sedimentary
Painted River Pebble (likely Basalt or Greywacke)
Aphanitic Lithic Clast with Anthropogenic Pigment coating
Sedimentary or Igneous
Green fluorite crystal
Fluorite (calcium fluoride, CaF₂)
mineral
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Smoky quartz crystal
Quartz, SiO₂; likely smoky quartz, possibly coated or included
mineral
Tumbled amethyst
Quartz, SiO₂; purple variety colored mainly by iron-related defects and irradiation
mineral
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
sedimentary
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Fossilized Ray Barb (Stinger) Fragment
Myliobatiformes indet. (Fossil stingray spine)
fossil
Weathered rhyolite or felsic volcanic rock
Rhyolite, commonly quartz–alkali feldspar–plagioclase with iron-oxide alteration
igneous
Polished Morganite (pink beryl), possibly rose quartz
Beryl, Be₃Al₂Si₆O₁₈, colored by manganese; visual identification is uncertain because the image is blurred
gemstone
Unakite (Epidote and Feldspar)
Unakite (modified granite composed of Epidote Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH) and Orthoclase KAlSi3O8)
metamorphic
Fossilized Stingray Mouth Plate
Myliobatidae gen. et sp. indet. (e.g., Myliobatis, Aetobatus)
fossil
Chert (Arrowhead or Projectile Point)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Diamond
Diamond (C)
Mineral
Gray flint/chert flake or tool
Microcrystalline quartz (SiO₂), commonly chalcedony
sedimentary
Titanium Coated Aura Quartz (Apple Aura Quartz)
Silicon Dioxide (SiO2) with Metallic Vapor Deposition Coating
Mineral (Man-modified)
Nephrite Jade
Nephrite
Mineral/Rock
Amphibolite
Amphibolite
metamorphic
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Schist
Mica Schist
metamorphic
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral