Man Made Glass Mineral Simulant

Snowflake Obsidian

Hydrated Volcanic Glass (primarily SiO2) with Cristobalite inclusions

Muscovite

Muscovite (KAl2(AlSi3O10)(OH)2)

Mahogany Obsidian

Volcanic glass (high silica) with inclusions of Magnetite or Hematite

Obsidian

Obsidian (Volcanic Glass, ~70% SiO2)

Obsidian

Volcanic glass (SiO2-rich)

Green Fluorite

Fluorite (Calcium Fluoride, CaF2)

Green fluorite (likely)

Fluorite — calcium fluoride, CaF₂

Blue Calcite

Calcite (Calcium Carbonate, CaCO3)

Obsidian

Obsidian (Volcanic Glass)

Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite

Quartz–feldspar aggregate; identification is uncertain from the photograph

Raw Citrine Quartz

Silicon Dioxide (SiO2)

Slag Glass (Cullet Glass)

Amorphous Silica (Industrial byproduct)

Quartz Pebble

Silicon Dioxide (SiO2)

Rough Apatite in Matrix

Fluorapatite / Chlorapatite / Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Obsidian (black volcanic glass)

Obsidian; predominantly rhyolitic volcanic glass, mainly SiO₂ with minor feldspar, quartz, and iron oxides

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Snowflake Obsidian

Volcanic glass with Phenocrysts (SiO2)

Obsidian

Volcanic Glass (Amorphous Silica, SiO2)

Black Obsidian

Obsidian (Volcanic Glass), primarily SiO2 (Silicon Dioxide)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Nut

SiO2 (Silicon Dioxide)

Polished orbicular jasper (likely ocean jasper)

Silicified microcrystalline quartz/chalcedony with iron-oxide-rich orbicules; commonly called Ocean Jasper

Fluorite

Calcium Fluoride (CaF2)

Quartz

Silicon Dioxide (SiO2)

Mica / Muscovite or Biotite

Phyllosilicate mineral group (e.g., KAl2(AlSi3O10)(OH)2)

Tumbled Quartz Pebble

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Snowflake Obsidian

Volcanic glass containing Cristobalite (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz Vein Rock

Silicon dioxide (SiO2) within a host rock matrix

Slag Glass

Silicon dioxide with impurities

Pink Granite (Unakite-bearing or Epidote-bearing Granite)

Plutonic Igneous Rock (Granite)

Blue-green raw mineral specimen, likely apatite

Fluorapatite, Ca₅(PO₄)₃F (probable; visual identification only)

Clear quartz crystal point

Quartz (silicon dioxide, SiO₂), likely a polished or cut crystal

Fulgurite

Fulgurite (Lechatelierite-rich variety)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Clear Quartz

SiO2 (Silicon Dioxide)

Quartz (Smoky/Brown variety)

Silicon dioxide (SiO2)