Man Made Mineral Simulant (Glass)

Sandstone

Arenite (composed primarily of SiO2)

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony (likely agate/chert variety)

Microcrystalline quartz, SiO₂

Iron-stained quartz crystal

Quartz (SiO₂), likely iron-oxide-coated or included

Mahogany Obsidian

Volcanic Glass (SiO2 with Hematite/Magnetite inclusions)

Black Sapphire (Basaltic Blue Sapphire)

Corundum (Al2O3)

Brecciated jasper/chalcedony (iron-stained silica)

Microcrystalline quartz, SiO₂, with iron-oxide inclusions

Quartz

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Agate Nodule / Chalcedony

Silicon Dioxide (SiO2)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Quartz with Spessartine Garnet and Iron Staining

Silicon Dioxide (SiO2) with Almandine-Spessartine (Mn3Al2(SiO4)3)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky quartz

Quartz, silicon dioxide (SiO₂)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz pebble

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2)

Pink-and-gray quartz-rich pegmatite, possibly rose quartz with feldspar

Quartz (SiO₂) with K-feldspar/plagioclase; likely pegmatitic granite

Quartz

Silicon dioxide (SiO2)

Sandstone

Arenite (SiO2 primarily)

Snowflake Obsidian

Vitreous volcanic silicate (SiO2 with Cristobalite inclusions)

Quartz Crystal Matrix

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Quartz Mineral

Silicon Dioxide (SiO2)

Green Fluorite

Calcium Fluoride (CaF2)

Quartz Vein on Matrix

Silicon Dioxide (SiO2)

Muscovite (White Mica)

Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2

Weathered sandstone or granitic rock fragment

Likely quartz-rich sandstone; exact identification requires testing

Quartz (Milky/Crystalline variety)

Silicon Dioxide (SiO2)

Chert (Flint variety)

Microcrystalline or cryptocrystalline Quartz (SiO2)

Rose Quartz

Silicon Dioxide with trace inclusions (SiO2)

Tumbled green aventurine

Quartzite dominated by quartz (SiO₂), with green fuchsite mica inclusions

Amethyst quartz cluster

Quartz, SiO₂; purple color caused mainly by iron-related defects and irradiation

White chalcedony or quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly with minor calcite or feldspar

Quartz Vein in Matrix

Silicon Dioxide (SiO2) within Rhyolitic or Granitic Matrix

Chert (specifically Flint or Common Chert)

Chert (Cryptocrystalline Silica, SiO2)

Quartz

Silicon dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)