Quartz Vein in Matrix (Breccia / Host Rock with Quartz)
Silicon Dioxide (SiO2) in Host Rock Matrix
metamorphic
Category
Sedimentary Or Metamorphic (Base Substrate)
Browse sedimentary or metamorphic (base substrate) specimens identified by the Rock Identifier community.
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Unidentified weathered rock fragments
Likely mixed silicate rocks; specific identification requires testing
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Dragon Blood Jasper
Epidote with Red Piedmontite (Chalcedony/Quartz variant)
sedimentary
Pyrite-bearing rock (iron pyrite)
Pyrite, FeS₂, likely disseminated or massive in a host rock
mineral
Granitoid Gneiss with Feldspar Vein
Gneiss (High-grade Metamorphic Rock) with Potassium Feldspar (KAlSi3O8)
metamorphic
Ferruginous Quartz
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
mineral
Iolite (Cordierite)
Magnesium Iron Aluminum Silicate (Mg,Fe)2Al4Si5O18
mineral
Red Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Shungite
Non-crystalline carbon (allotrope of carbon)
metamorphic
Granite Gneiss
Granitoid Gneiss
metamorphic
Graphite
Graphite (C)
mineral
Sandstone with Liesegang Rings
Quartzose Sandstone with Iron Oxide Precipitation
sedimentary
Petrified Wood with Lichen
Silicified Wood (SiO2) colonized by crustose lichens
fossil
Gold Mineral
Native Gold (Au)
mineral
Gravel / Crushed Stone
Aggregate (mixed mineral rock fragments)
sedimentary
Gneiss
Gneiss
metamorphic
Greenschist
Chlorite Schist
metamorphic
Pyrite-bearing schist (likely mica schist)
Muscovite–quartz schist with disseminated pyrite (FeS₂)
metamorphic
Quartzite Pebbles with Quartz Veining
SiO2 (Silicon Dioxide with country rock matrix)
metamorphic
Yellow Quartz River Pebble
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
mineral
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Gneiss (Metamorphosed Granitic Rock)
Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)
metamorphic
Epidote
Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))
metamorphic
Quartzite River Rock
Quartzite (primarily SiO2)
metamorphic
Epidote with Quartz Vein
Epidote-bearing metamorphic rock with quartz (Ca2(Al,Fe)3(SiO4)3(OH))
metamorphic
River Pebble (Gneiss/Schist mix)
Metamorphic rock aggregate
metamorphic
Red Jasper
Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)
sedimentary
Quartz Pebble
Silicon dioxide (SiO2)
mineral
Granite Pebble
Granitoid (Felsic Plutonic Rock)
igneous
Gneiss
Gneiss (Foliated Metamorphic Rock)
metamorphic
Jasper
Silicon dioxide (SiO2)
sedimentary
Oyster shell fragment
Ostreidae shell; primarily calcite (CaCO₃)
fossil
Gneiss
Gneiss
metamorphic
Muscovite
Muscovite (KAl2(AlSi3O10)(OH)2)
mineral
Gneiss
Gneiss (High-Grade Metamorphic Rock)
metamorphic
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Chondrite Meteorite
Ordinary Chondrite (L or H type)
igneous
Gneiss
Gneiss (SiO2-rich metamorphic rock)
metamorphic
K2 Stone
Azurite in Granite
igneous
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic