Granite
Granite (Felsic Plutonic Rock)
igneous
Category
Mineral (Specifically A Cryptocrystalline Variety Of Quartz)
Browse mineral (specifically a cryptocrystalline variety of quartz) specimens identified by the Rock Identifier community.
Chert (specifically Chalcedony/Flint variant)
Silicon Dioxide (SiO2)
sedimentary
Zebra Jasper
Silicon Dioxide (SiO2) - Macro-crystalline Quartz/Chert with impurities
sedimentary
Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Yellow Quartz (Citrine/Lemon Quartz)
Silicon Dioxide (SiO2)
mineral
Chert (specifically Flint or Common Chert)
Silicon Dioxide (SiO2)
sedimentary
Amethyst Geode
Silicon Dioxide (SiO2) - Amethyst variety of Quartz
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Smoky Quartz Cluster
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Blue Agate
Chalcedony (SiO2)
mineral
Agate (Chalcedony)
Agate (Silicon Dioxide - SiO2)
mineral
Chert (Jasper variation)
Silicon dioxide (SiO2)
sedimentary
Ocean Jasper
Orbicular Jasper (Silicon Dioxide, SiO2)
mineral
Chert (Nodule)
Silicon dioxide (SiO2) - Cryptocrystalline Quartz
sedimentary
Pegmatite with Schorl (Black Tourmaline) and Mica
Pegmatite (complex association of NaAlSi3O8, NaFe3Al6(BO3)3Si6O18(OH)4, and KAl2(AlSi3O10)(OH,F)2)
igneous
Veined Quartz
SiO2 (Silicon Dioxide)
Mineral
Sandstone (Stream-rounded)
Arenite (SiO2 based)
sedimentary
Quartz
Silicon Dioxide (SiO2)
Mineral
Chlorastrolite (Isle Royale Greenstone)
Chlorastrolite (Pumpellyite-(Mg,Fe2+): Ca2MgAl2(Si2O7)(SiO4)(OH)2∙H2O)
mineral
Petrified Wood
Silicified Wood (SiO2)
metamorphic
Yellow Quartz (Citrine or Yellow Chalcedony)
Silicon Dioxide (SiO2)
mineral
Chert Pebble with Quartz Veining
Microcrystalline Quartz (SiO2)
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide, SiO2)
mineral
Chert (Mudstone)
Microcrystalline Quartz (SiO2)
sedimentary
Smoky Quartz
Smoky Quartz (Silicon Dioxide - SiO2)
mineral
Granite
Plutonic felsic rock (Quartz, Feldspar, Mica)
igneous
Amethyst (Quartz Variety)
Amethyst (Silicon Dioxide - SiO2 with ferric iron impurities)
mineral
Amethyst (variety of Quartz)
SiO2 (Silicon Dioxide)
Mineral
Chert (Flint)
Silicon Dioxide (SiO2)
sedimentary
Chert (Nodule / Geode fragment)
Microcrystalline Quartz (SiO2)
sedimentary
Blue Chalcedony
Chalcedony (SiO2)
mineral
Yellow Jasper
Silicon Dioxide (SiO2) with iron oxide inclusions
sedimentary
Citrine Quartz
Silicon Dioxide (SiO2)
mineral
Massive Quartz (Yellow/Citrine variety)
Silicon Dioxide (SiO2)
mineral
Fossilized Wood (Petrified Wood)
Silicified Wood (primarily quartz/chalcedony replacing organic matter)
Sedimentary (with some aspects of mineral replacement)
Labradorite (likely Black Labradorite or Larvikite)
Labradorite (Na,Ca)(Al,Si)4O8. If a rock, it is typically anorthosite, gabbro, or norite, or a variety of syenite called Larvikite if it is specifically from Larvik, Norway.
Mineral/Igneous Rock
Pink Granite
Phaneritic Plutonic Igneous Rock (composed of K-feldspar, Quartz, and Mica)
igneous
Orange Calcite (Banded Calcite)
Calcium Carbonate (CaCO3)
mineral
Ametrine
SiO2 (silicon dioxide)
Mineral
Black Chert
Chert (microcrystalline quartz)
Mineral
Quartz
Silicon Dioxide (SiO2)
Mineral