Granite

Browse granite specimens identified by the Rock Identifier community.

Quartz

Quartz (SiO₂)

Mineral

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Mineral

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Mineral

Pink Tourmaline in Quartz Matrix

Elbaite (Na(Li,Al)3Al6(Si6O18)(BO3)3(OH)4) in Quartz (SiO2)

mineral

Quartz (likely tumbled or naturally water-worn)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Black Tourmaline

Schorl (Sodium Iron Aluminum Borosilicate Hydroxide); NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

mineral

Epidotite (Unakite variety)

Epidotized Granite (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

metamorphic

Quartz

Quartz (SiO₂)

Mineral

Quartz

Quartz (Silicon Dioxide - SiO2)

Mineral

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Metamorphic Rock

Banded Gneiss

Gneiss

Metamorphic

Quartz (River Pebble)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Raw Citrine

Citrine (Silicon Dioxide - SiO2)

mineral

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)

mineral

Quartz (likely Milky Quartz or Chalcedony)

Quartz (SiO2 - Silicon Dioxide)

Mineral

Amethyst

Amethyst is a variety of Quartz (SiO₂)

Mineral

Quartz Crystal

Quartz (SiO₂)

Mineral

Garnet (Almandine or Spessartine likely)

Garnet Group Minerals (e.g., Almandine Fe3Al2(SiO4)3, Pyrope Mg3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3)

Mineral

Amazonite

K(AlSi3O8) - Microcline variant

mineral

Amazonite

Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)

mineral

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Mineral

Quartz (likely milky/gray variety)

Quartz (SiO₂)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Diorite (possibly fine-grained variety or a related intermediate intrusive rock like a felsic gabbro or a dark granodiorite)

Diorite (Igneous rock, intrusive, intermediate composition)

Igneous Rock

Moonstone

Orthoclase Feldspar (KAlSi3O8)

Mineral

Banded Gneiss

Gneiss (variable mineral composition)

metamorphic

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral

Bauxite Ore

Hydrated aluminum oxides (e.g., Gibbsite Al(OH)3, Boehmite ̲̲̲̲AlOOH, Diaspore ̲̲̲̲AlOOH)

Mineral

Rutilated Quartz

Quartz (SiO2) with Rutile inclusions (TiO2)

Mineral

Quartz

Quartz (SiO₂)

Mineral

Pebble (river rock/beach pebble)

Pebble (clast size class)

Sedimentary Rock

Rose Quartz

SiO2 (Silicon Dioxide)

mineral

Black Tourmaline

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

mineral

Quartz Geode/Cluster

Quartz (SiO2)

mineral

River Cobble (Conglomerate context)

Unconsolidated Fluvial Alluvium (comprised of various lithologies like Quartzite, Granite, or Basalt)

sedimentary

Painted Garden Rock (likely Granite or Limestone base)

Silicon Dioxide (SiO2) / Calcium Carbonate (CaCO3) based substrate with Acrylic/Enamel pigments

igneous or sedimentary (anthropogenic modification)

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

igneous

Gneiss

Gneiss (a type of metamorphic rock)

Metamorphic Rock

Smoky Quartz

SiO2 (Silicon Dioxide)

Mineral

Lepidolite (likely)

K(Li,Al)3(Al,Si)4O10(F,OH)2 (Phyllosilicate mineral, part of the mica group)

Mineral

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Mineral

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

Mineral