Mineral And Glass

Greenish translucent glassy mineral specimen, possibly fluorite or quartz

Likely fluorite (CaF₂) or green quartz (SiO₂); exact identification requires hardness and cleavage tests

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Small pale mineral fragment, likely quartz or calcite

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Mica Schist or Muscovite

KAl2(AlSi3O10)(OH)2

Clear Quartz

Silicon Dioxide (SiO2)

Pegmatite (with Muscovite Mica and Quartz)

Granitic Pegmatite (chiefly KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz on Schist

Silicon Dioxide (SiO2) on Foliated Metamorphic Rock

Mixed small mineral specimens

Likely quartz varieties with possible rose quartz and iron-stained quartz; exact identification is uncertain from the blurred image

Tumbled Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

Blue glass-like bead or gemstone keychain ornament

Indeterminate; likely cobalt-blue glass or synthetic blue spinel, not identifiable as a natural mineral from the image

Quartz in Matrix (Lepidolite or Quartzite)

Silicon Dioxide (SiO2) with host rock

Polished blue calcite sphere (tentative identification)

Calcite, CaCO₃; blue color generally results from trace impurities or inclusions

Clear Quartz

Silicon Dioxide (SiO2)

Green obsidian (likely molded or heat-treated glass-like specimen)

Volcanic glass; predominantly rhyolitic composition (silica-rich amorphous SiO₂)

Tektite

Natural impact glass

Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2)

Sheen Obsidian

Volcanic glass (SiO2 with inclusions)

Blue glassy mineral fragment, likely kyanite or blue corundum

Tentatively kyanite (Al₂SiO₅); visual identification is uncertain from the photograph

Quartz (Smoky/Milky variety)

Silicon Dioxide (SiO2)

Fulgurite

Lechatelierite (Silica Glass)

Slag Glass

Silicon dioxide with impurities

Quartz (Druzy)

Silicon Dioxide (SiO2)

Potassium Feldspar

Orthoclase (KAlSi3O8)

Quartz (Granular)

Silicon Dioxide (SiO2)

Quartz Pebbles

Silicon Dioxide (SiO2)

Goldstone (blue-goldstone–style glass) beads

Artificial aventurine glass, typically silica glass with copper inclusions; not a natural mineral

Clear quartz crystal (likely)

Quartz, silicon dioxide (SiO₂)

Muscovite (Mica)

Muscovite - KAl2(AlSi3O10)(OH)2

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(OH)2

Clear Quartz (Tumbled)

Silicon Dioxide (SiO2)

Blue quartz (likely dyed or synthetic-treated quartz beads)

Quartz, silicon dioxide (SiO₂)

Polished blue-green glassy slag or coated mineral fragment

Most likely man-made colored glass/slag; exact composition cannot be determined visually

Lepidolite

K(Li,Al)3(Al,Si,4)10(O,F,OH)2

Opalite

Synthetic Glass / Man-made Opal Simulant

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Quartz with Mica inclusions (likely Iron-stained)

Silicon Dioxide (SiO2) with Phyllosilicates

Smoky quartz chips

Quartz, SiO₂ (smoky variety)