Granite
Granite (composed mainly of Quartz, Feldspar, and Mica)
igneous
Category
Mineral Composite
Browse mineral composite specimens identified by the Rock Identifier community.
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Amphibolite
Amphibolite
metamorphic
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Iron-Stained Quartz (Riverside Cobble)
Silicon Dioxide (SiO2) with Limonite/Hematite inclusions
mineral
Snowflake Obsidian
Volcanic Glass with Spherulite Inclusions (70–75% SiO2)
igneous
Okenite
Okenite, Ca3Si6O15·6H2O
mineral
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Sandstone
Arenite (Siliclastic sedimentary rock)
sedimentary
Granite
Intrusive Igneous Rock
igneous
Copper Ore (with Malachite and Azurite)
Hydroxide copper carbonate (Cu2CO3(OH)2 / Cu3(CO3)2(OH)2)
mineral
Schist
Mica Schist
metamorphic
Dyed Howlite (simulating Lavender/Purple Jade or Charoite)
Howlite: Ca2B5SiO9(OH)5 (when natural)
Mineral
Granite
Intrusive Igneous Rock
igneous
Sandstone (with secondary weathering/concretion)
Arenite (composed primarily of Quartz, SiO2)
sedimentary
Quartz-bearing Ore (likely Gold-bearing Quartz)
Quartz (SiO2) with potential sulfide mineralization (Pyrite/Arsenopyrite)
mineral/hydrothermal
Gneiss (specifically a Hornblende Gneiss or Micaceous Gneiss)
Gneiss (metamorphic rock composed primarily of quartz, feldspar, and mafic minerals)
metamorphic
Schist
Mica Schist
metamorphic
Granite Pebble
Intrusive Igneous Rock
igneous
Peacock Ore
Bornite (Cu5FeS4) with surface tarnish
mineral
Diorite with Quartz Veins
Diorite
igneous
Sandstone (Iron-stained)
Quartz Arenite with Iron Oxide Stain (SiO2 + Fe2O3)
sedimentary
Sandstone
Sandstone (SiO2 dominant)
sedimentary
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Pearl
Biogenic CaCO3 (Aragonite and Calcite)
mineral
Veined Pebble (likely a Quartz-Veined Pebble)
Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)
Sedimentary Rock (possibly conglomerate or breccia with a quartz vein)
Dalmatian Jasper
Peralkaline Quartz-Feldspar Rock with Arfvedsonite
igneous
Sandstone
Arenite (SiO2 dominant)
sedimentary
Sandstone
Arenite (SiO2 based with mineral cements)
sedimentary
Native Copper
Copper (Cu)
mineral
Petrified wood
Silicified wood, commonly quartz/chalcedony (SiO₂) replacing wood tissue
fossil
Polished brecciated jasper
Jasper, opaque microcrystalline quartz (SiO₂), likely brecciated jasper with iron-oxide and dark silicate inclusions
mineral
Quartz Pebble
Silicon Dioxide (SiO2)
sedimentary
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Quartz Pebble
Silicon dioxide (SiO2)
sedimentary
Milky Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Greenschist
Chlorite Schist
metamorphic
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Blue Lepidolite
Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)
mineral
Quartz (Fieldstone/Pebble)
Silicon Dioxide (SiO2)
mineral
Indigo Gabbro
Gabbro (MaFIC intrusive rock)
igneous
Quartz (River Pebble)
Silicon Dioxide (SiO2)
mineral
Feldspathic Gneiss (Granite Gneiss)
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic