Amethyst (Tumbled Quarz)
Silicon Dioxide (SiO2) with iron impurities
mineral
Category
Mineral And Glass
Browse mineral and glass specimens identified by the Rock Identifier community.
Quartz Pebble (Chert/Chalcedony)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica (Granitic Pegmatite)
Muscovite - KAl2(AlSi3O10)(OH)2
igneous
Snowflake Obsidian
Spherulitic Obsidian (primarily SiO2)
igneous
Quartz / Common Opal Transition
Silicon Dioxide (SiO2)
mineral
Amethyst (Rose-tinted variation)
Silicon Dioxide (SiO2) with trace iron impurities
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Black Obsidian
Obsidian (Volcanic Glass)
igneous
Clear Quartz (Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Pumice or Tufa/Travertine
Pumice (if igneous) or Calcareous Tufa (if sedimentary)
igneous/sedimentary
Quartz (Druzy)
Silicon Dioxide (SiO2)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Feldspar (Orthoclase)
Orthoclase Feldspar (KAlSi3O8)
mineral
Quartz (specifically Clear Quartz or Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Slag Glass
Amorphous Silica / Glass Slag
industrial byproduct (anthropogenic rock-like material)
Muscovite Mica (Granitic Pegmatite)
Muscovite - KAl2(AlSi3O10)(OH)2
mineral
Black Obsidian
Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)
igneous
Quartz (Milky/Chalcedony variety)
Silicon Dioxide (SiO2)
mineral
Quartzite and Jasper Pebbles
Quartzite (re-crystallized Quartz) and Cryptocrystalline Quartz (SiO2)
metamorphic
Quartz (Smoky or Clear variety with inclusions)
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Rose Quartz
Silicon dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Quartz (Milky/Clear Quartz)
Silicon Dioxide (SiO2)
mineral
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Chalcedony
Cryptocrystalline Quartz (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz (Milky/Common Quartz)
Silicon Dioxide (SiO2)
mineral
Quartz (Milky or Rough Quartz)
Silicon Dioxide (SiO2)
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartz (Clear/White)
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Green Slag Glass
Amorphous Silica / Glassy Blast Furnace Slag
Mineraloid (Industrial byproduct)
Snowflake Obsidian
Volcanic glass containing Cristobalite (SiO2)
igneous
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz
Silicon Dioxide (SiO2) with iron oxide inclusions (Limonite/Goethite)
mineral
Quartz Pebble
Quartz (Silicon Dioxide - SiO2)
mineral
Garden Quartz (Lodalite)
Silicon Dioxide with various mineral inclusions (SiO2)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Amethyst
Amethyst (Silicon Dioxide - SiO2)
mineral