Amethyst
Amethyst (Quartz variety), Silicon Dioxide (SiO2)
Category
Browse mineral (specifically, a variety of the mineral species pyrope almandine garnet) specimens identified by the Rock Identifier community.
Amethyst
Amethyst (Quartz variety), Silicon Dioxide (SiO2)
Amazonite
K(AlSi3O8) - Microcline (Lead-bearing variety)
Milky Quartz
Silicon Dioxide (SiO2)
Sandstone (specifically Cross-bedded Sandstone)
Arenite (composed primarily of SiO2)
Dyed Agate
Silicon Dioxide (SiO2) - variety Chalcedony
Argetine Blue Agate (Chalcendony variant)
Silicon Dioxide (SiO₂)
Dendritic Agate
Silicon Dioxide (SiO2) with inclusions
Jasper
Jasper (Silicon Dioxide, SiO2)
Hematite (Botryoidal/Kidney Ore)
Iron(III) oxide (Fe2O3)
Red Jasper
Silicon Dioxide (SiO2) with Hematite inclusions
Druzy Quartz Geode (likely Smokey Quartz variety)
Silicon Dioxide (SiO2) - specifically a geode formation lined with druzy quartz crystals, with a likely brownish hue indicating smokey quartz.
Blue Quartz (Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically crocidolite or dumortierite)
Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Gneiss (specifically a Banded Gneiss cobble)
Gneiss (composed mainly of Quartz, Feldspar, and Biotite/Amphibole)
Obsidian
Obsidian (Volcanic Glass)
Milky Quartz
Silicon Dioxide (SiO2)
Rose Quartz
Silicon Dioxide (SiO2)
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
Transit Token (RTD Denver)
Nickel-plated brass or bronze alloy (Cu-Sn-Zn-Ni)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Yellow Banded Agate
Silicon Dioxide (SiO₂)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Grey Agate (Tumbled)
Silicon Dioxide (SiO2)
Milky Quartz
Silicon Dioxide (SiO2)
Quartz
Silicon Dioxide (SiO2)
Epidote with Quartz and Feldspar
Ca2(Al2,Fe3+)(SiO4)3(OH) (Epidote complex)
Clear Quartz / Rock Crystal
Silicon Dioxide (SiO2)
Citrine Quartz
Silicon Dioxide (SiO2)
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
Amazonite
KAlSi3O8 (Potassium Feldspar, variety of Microcline)
Jasper
Silicon dioxide (SiO2)
Ferruginous Quartz
Silicon Dioxide (SiO2) with Hematite/Limonite inclusions
Quartz (Smoky/Clear variety)
Silicon Dioxide (SiO2)
Quartz
Silicon dioxide (SiO2)
Jasper
Jasper (Silica/Silicon Dioxide, SiO2)
Gneiss (specifically Granitic Gneiss)
Gneissic Metamorphic Rock
Chert (specifically Banded Chert)
Microcrystalline or Cryptocrystalline Quartz (SiO2)