Mineral And Glass

Browse mineral and glass specimens identified by the Rock Identifier community.

Goldstone

Not a natural mineral or rock. It is an ornamental glass.

Manufactured Glass (Simulant)

Muscovite Mica (on Quartz Matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

mineral

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

mineral

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

mineral

Quartz in Matrix (possibly with Biotite or Hornblende)

Quartz (Silicon Dioxide, SiO2) in Granitic Matrix

igneous

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Snowflake Obsidian

Volcanic glass with Cristobalite inclusions (70–75% SiO2)

Igneous

Cullet (Slag Glass)

Amorphous Silica (SiO2) with various metal oxide colorants

mineraloid / anthropogenic

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

mineral

Quartz (River Pebble)

Silicon Dioxide (SiO2)

mineral

Blue Goldstone

Aventurine Glass (Silicon Dioxide with metal inclusions)

man-made glass mineral simulant

Goldstone

Aventurine Glass (Man-made)

mineral

Slag Glass (Cullet)

Amorphous Silicon Dioxide (SiO2) with metal oxide colorants

Anthropogenic (Man-made)

Green glass sphere/marble

Soda-lime glass (primarily SiO2, Na2O, CaO)

Man-made object (Simulant)

Muscovite Mica (with Quartz matrix)

Muscovite - KAl2(AlSi3O10)(OH)2

mineral

Snowflake Obsidian

Volcanic glass containing Spherulite inclusions (primarily Cristobalite, SiO2)

igneous

Obsidian

Volcanic glass

igneous

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

mineral

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

mineral

Quartz Mineral

Silicon Dioxide (SiO2)

mineral

Clear Quartz

Silicon Dioxide (SiO2)

mineral

Obsidian

Extrusive igneous volcanic glass (rich in SiO2)

igneous

Chert / Flint

Silicon Dioxide (SiO2)

sedimentary

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

mineral

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

mineral

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

mineral

Opalite

Man-made glass (traditionally simulated Opal)

mineral

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Igneous

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

mineral

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Mineral

Milky Quartz

Silicon Dioxide (SiO2)

mineral

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

mineral

Mica (Biotite or Phlogopite variety)

Phyllosilicate (complex mineral formula involving K, Mg, Fe, Al, Si, and O)

mineral

Quartz Pebbles

Silicon Dioxide (SiO2)

mineral

Quartz

Silicon Dioxide (SiO2)

mineral

Quartz (Druzy)

Silicon Dioxide (SiO2)

mineral

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

mineral

Smoky Quartz

Smoky Quartz (Silicon Dioxide, SiO2)

mineral

Quartz / Milky Quartz

Silicon Dioxide (SiO2)

mineral

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

mineral

Obsidian

Volcanic glass (SiO2-rich extrusive igneous rock)

igneous

Quartz with Mica inclusions (likely Iron-stained)

Silicon Dioxide (SiO2) with Phyllosilicates

mineral