Man Made Mineral Simulant (Glass)

Tektite (Indochinite)

Natural glass (High-silica impact glass)

Clear quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz with Epidote / Chlorite Inclusions

Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)

Mixed Mineral Specimens

Mixed Silicates, Oxides, and Phosphates (SiO₂, Ca₅(PO₄)₃(F,Cl,OH), Na₈Al₆Si₆O₂₄Cl₂, etc.)

Quartz Sand / Sandstone grains

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz and Quartzite

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite KAl2(AlSi3O10)(OH)2

Turquoise cabochon jewelry

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony (Common Opal/Chert variety)

Silicon Dioxide (SiO2)

Diabase (Greenstone Pebble)

Diabase or Dolerite

Sandstone

Arenite (SiO2 primarily)

Sandstone

Arenite (primarily SiO2 with trace Fe2O3)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Blue Quartz (Dumortierite Quartz)

SiO2 containing inclusions of Dumortierite [Al7(BO3)(SiO4)3O3]

Quartz with inclusions

SiO2

Tumbled quartz pebble

Quartz (silicon dioxide, SiO₂)

Polished orbicular ocean jasper

Silicified volcanic rock; chiefly microcrystalline quartz (SiO₂) with feldspar, chlorite, and iron-oxide inclusions

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Smoky Quartz and Clear Quartz Geode

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Stainless Steel Spoon

Iron-Chromium Alloy (Fe + Cr + Ni)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sandstone

Arenite (mainly SiO2 with varying cements)

Sandstone (Quartzose)

Arenite (primarily SiO2)

Sandstone

Arenite

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely ferruginous milky quartz

Quartz pebble

Silicon dioxide (SiO2)

Fluorite (often referred to as Rainbow Fluorite)

Fluorite (Calcium Fluoride, CaF2)

Polished amethyst pyramid

Amethyst, purple quartz (SiO₂)

Tumbled blue chalcedony or pale aquamarine-like quartz

Chalcedony (microcrystalline SiO₂), possibly blue quartz; visual identification is uncertain

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Milky quartz-bearing rock

Quartz (SiO₂), likely massive milky quartz; possibly quartz-rich pegmatite