Quartz Crystal Cluster on Matrix
Silicon Dioxide (SiO2)
mineral
Category
Metamorphic (Likely Gneiss Or Schist Based On Texture)
Browse metamorphic (likely gneiss or schist based on texture) specimens identified by the Rock Identifier community.
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Quartz Cobble (River Rock)
Silicon Dioxide (SiO2)
mineral
Quartz (Vein Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz Vein in Host Rock
Silicon Dioxide (SiO2) with host rock (often Schist or Basalt)
mineral
Painted River Rock
Anthropogenic-modified Siliciclastic Sedimentary Rock
Sedimentary
Quartzite
Quartzite (SiO2)
metamorphic
Crushed Stone / Gravel (Multiple Rock Types)
Lithic fragments (undifferentiated)
Igneous, Sedimentary, and Metamorphic mix
Fossil Shark Tooth
Carcharhiniformes fossil (likely Carcharhinidae family)
fossil
Pink Granite
Phaneritic intrusive igneous rock (Feldspar-Quartz-Mica)
igneous
Granite
Phaneritic plutonic rock (Quartz + Alkali Feldspar + Plagioclase Feldspar)
igneous
Chert (River Siltstone/Quartzite)
Sedimentary Cryptocrystalline Quartz (SiO2)
sedimentary
Banded calcite (likely marble or calcite-rich limestone)
Calcite, CaCO₃; possibly calcitic marble
metamorphic
Quartzite pebble
Crystalline silica (SiO2)
metamorphic
Quartzite (Milky Quartz pebble)
Silicon Dioxide (SiO2)
metamorphic
Quartzite (Iron-stained)
Quartzite (SiO2 with Fe-oxides)
metamorphic
Chert (Flint) with Glauconite
Microcrystalline Quartz (SiO2)
sedimentary
Fossil Shark Tooth
Elasmobranchii (Class) fossil - possibly Odontaspididae family
fossil
Chert (River Siltstone/Quartzite type)
Microcrystalline Quartz (SiO2)
sedimentary
Quartz (Grain)
Silicon Dioxide (SiO2)
mineral
Black Tourmaline
Schorl (Na(Fe²⁺)₃Al₆(OH)₄(BO₃)₃Si₆O₁₈)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Smoky Quartz in Matrix
Silicon dioxide (SiO2) within Pegmatite/Gneiss
igneous
Chert (River Cobble)
Chert (Cryptocrystalline Quartz, SiO2)
sedimentary
Jasper with Epidote Vein
Silicon Dioxide (SiO2) with Calcium Aluminum Iron Silicate (Ca2(Al,Fe)3(SiO4)3(OH))
sedimentary
Blue-and-gold lapis lazuli fragment
Lapis lazuli; lazurite-rich calc-silicate rock (primarily lazurite, with calcite and pyrite)
metamorphic
Chert (Flint)
Microcrystalline Quartz (SiO2)
sedimentary
Mixed mineral and rock collection
Predominantly quartz varieties, including amethyst, plus likely calcite, feldspar, mica, and miscellaneous polished stones
mineral
Basalt with Epidote Veins
Mafic Igneous Rock (Basalt)
igneous
Epidote
Epidote {Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)
mineral
Granite Pebble
Granite (Phaneritic Quartz-Feldspar intrusive rock)
igneous
Chert (Nodular)
Microcrystalline Silica (SiO2)
sedimentary
Vesicular Basalt
Basalt (Mafic volcanic rock)
igneous
Pet Rock (Quartzite/Sandstone River Rock)
Silicon Dioxide (SiO2) mixture
sedimentary
Vesicular Basalt with Lichen
Vesicular Basalt
igneous
Granite or Porphyritic Igneous Rock (weathered)
Granitoid
Igneous
Heat-Treated Citrine (Amethyst-based)
Quartz (Silicon Dioxide) - SiO2
mineral
Red Sandstone or Brick Fragment
Arenite (if sandstone)
sedimentary
Rounded dark river pebble
Likely fine-grained basalt or andesite; exact identification requires a fresh surface or tests
sedimentary
Man-made Metal Pin (Non-geological)
Antimony-Lead Alloy or Zinc/Brass Base with Electroplating
Metal Alloy / Manufactured Artifact
Granite (Worn Pebble)
Granite
igneous
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Likely pink feldspar-rich granite or pegmatite
Granite/pegmatite; primarily quartz (SiO₂), alkali feldspar (KAlSi₃O₈), and plagioclase feldspar
igneous