Chert (Arrowhead variety)
Chert (SiO2)
sedimentary
Category
Metamorphic (Modified)
Browse metamorphic (modified) specimens identified by the Rock Identifier community.
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Chert (Flint) with Patina
Microcrystalline Quartz (SiO2)
sedimentary
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
Painted Sandstone Cobble
Clastic Sedimentary Rock (Sandstone base)
sedimentary
Chert (Arrowhead Artifact)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Diamond (Princess Cut Faceted Gemstone)
Native Carbon (C)
mineral
Painted Sandstone
Sandstone (clastic sedimentary rock) with acrylic/artistic coating
sedimentary
Chert Arrowhead
Cryptocrystalline microcrystalline Quartz (SiO2)
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
Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
River Pebble Gravel
Hydrothermally modified Clastic Sediment (mainly Quartzite and Chert)
sedimentary
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
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
Greenschist
Greenschist (containing Chlorite, Actinolite, and Epidote)
metamorphic
Rhodonite
Manganese Silicate (Mn, Fe, Mg, Ca)SiO3
mineral
Rhodonite
(Mn,Fe,Mg,Ca)SiO3
mineral
Schist
Mica Schist
metamorphic
Rhodonite
Manganese Silicate (Mn,Fe,Mg,Ca)SiO3
mineral
Garnet
Garnet group: X3Y2(SiO4)3 (commonly Almandine-Pyrope series)
mineral
Greenschist
Chlorite Schist
metamorphic
Raw Garnet (Hessonite / Spessartine)
Silicate mineral group (X3Y2(SiO4)3)
gemstone
Dumortierite in Quartz
Dumortierite (Al6O3(BO3)(SiO4)3) with Quartz (SiO2)
mineral
Aventurine
Silicon dioxide (SiO2) with inclusions
mineral
Greenschist
Greenschist (Chlorite Schist)
metamorphic
Ruby
Corundum (Al2O3 with chromium impurities)
mineral
Brown Garnet
Andradite or Almandine Garnet (general formula X3Y2(SiO4)3)
mineral
Garnet (Almandine/Pyrope series)
Garnet Group - X3Y2(SiO4)3
mineral
Epidote
{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Staurolite
Staurolite (Fe2+2Al9Si4O23(OH))
metamorphic
Muscovite Mica
KAl2(AlSi3O10)(OH)2
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)
mineral
Quartzite with Mica / Gneiss Pebble
Metamorphic Rock (Quartz-Feldspar-Mica aggregate)
metamorphic
Blue Dumortierite in Quartz
Al7(BO3)(SiO4)3O3 (Dumortierite)
mineral
Mica Schist
Mica Schist (Quartz-Mica Metamorphic Rock)
metamorphic
Zoisite with Hornblende
Zoisite (Ca2Al3(SiO4)3(OH)) with Amphibole inclusions
metamorphic