Red Quartzite (Strawberry Quartz)
Quartzite (SiO2 with iron oxide inclusions)
metamorphic
Category
Antropogenic (Man Made Glass Byproduct)
Browse antropogenic (man made glass byproduct) specimens identified by the Rock Identifier community.
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Chert (Nodule)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz
Quartz (SiO2 - Silicon Dioxide)
Mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Chert (Flint/Novaculite)
Microcrystalline Quartz (SiO2)
sedimentary
Milky Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Dark basalt or basaltic volcanic rock
Basalt, a fine-grained mafic volcanic rock composed mainly of plagioclase feldspar, pyroxene, and often olivine
igneous
Polished orbicular jasper
Jasper, a microcrystalline variety of quartz (SiO₂), colored by iron oxides and other accessory minerals
igneous
Polished petrified wood
Silicified wood, primarily microcrystalline quartz (SiO₂) replacing organic tissue
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Likely tumbled jasper or chert specimens
Microcrystalline quartz (SiO₂), commonly jasper/chert; exact identification is uncertain from the photograph
sedimentary
Obsidian / Volcanic Glass
Obsidian (principally SiO2, usually 70% or more)
igneous
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Hematite/Limonite staining
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Obsidian with Spherulitic Devitrification (Snowflake Obsidian/Mahogany related)
Volcanic Glass (70% or more SiO2)
igneous
Milky Quartz Pebble
Crystalline Silicon Dioxide (SiO2)
mineral
Quartz
Quartz (SiO₂ - Silicon Dioxide)
Mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Chert (specifically Flint or Common Chert)
Chert (Cryptocrystalline Silica, SiO2)
sedimentary
Polished black obsidian pyramid/block
Obsidian — natural volcanic glass, chiefly rhyolitic silica (approximately 70–75% SiO₂)
igneous
Sulfur
Native Sulfur (S)
mineral
Blue-green chrysocolla rough specimen
Chrysocolla, hydrated copper aluminosilicate; commonly associated with malachite, quartz, and limonite
mineral
Quartzite
Quartzite (SiO2 silicon dioxide)
metamorphic
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Pumice
Pumice (Vesicular volcanic glass)
igneous
Weathered, iron-stained rhyolite pebble (possibly rhyolitic volcanic breccia)
Rhyolite, a felsic volcanic rock; mainly quartz and alkali feldspar with minor plagioclase, altered mafic minerals, and iron-oxide staining
igneous
Coquina
Bioclastic Limestone
sedimentary
Sulfur
Native Sulfur (S)
mineral
Quartzite Cobble
Quartzite
metamorphic
Quartz
Quartz (SiO₂)
Mineral
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Polished black gemstone, likely black obsidian
Obsidian (volcanic glass), chiefly silica-rich amorphous SiO₂
igneous
Dyed Quartz Crystals
Silicon Dioxide (SiO2) with artificial pigment
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky quartz pebble
Quartz (SiO₂), commonly called milky quartz
mineral
Rose Quartz
Quartz (SiO₂), specifically a variety of Quartz
Mineral
Granite
Granite (Phaneritic Quartz-Feldspar Plutonic Rock)
igneous
Milky quartz (rough crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Smoky quartz
Quartz, silicon dioxide (SiO₂), brown to gray variety
mineral