Mineral Like (Natural Glass)

Milk Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Dyed Purple Agate

Silicon Dioxide (SiO2) - Cryptocrystalline Quartz

Quartz Pebble

Silicon Dioxide (SiO2)

Pink Dyed Agate (Banded Chalcedony)

Silicon dioxide (SiO2) - variety Chalcedony

Clear Quartz

Silicon Dioxide (SiO2)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Angel Aura Quartz (Treated Clear Quartz)

Silicon Dioxide (SiO2) coated with Vaporized Silver and Platinum

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Sandstone (Ferruginous)

Arenite with Iron-oxide inclusions (SiO2 primarily)

Tiger's Eye

Pseudomorph of quartz after crocidolite (SiO2 with iron oxide inclusions)

Rhodonite beads (possibly dyed or treated, or lower quality Rhodonite)

Manganese inosilicate, (Mn,Fe,Mg,Ca)SiO3

Diamond

C (Native Carbon)

Quartzite with Gneissic Banding

Quartzite (primarily SiO2) with mafic mineral inclusions

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Sandstone

Arenite

Hematite

Iron (III) Oxide (Fe2O3)

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Obsidian (Black)

Obsidian (approx. 70–75% SiO2)

Obsidian

Obsidian (Volcanic Glass, complex silicate)

Sandstone (with potential iron-oxide staining)

Arenite (primarily SiO2)

Ferruginous Quartz

Silicon Dioxide with Iron Oxide (SiO2 + Fe2O3)

Sandstone

Arenite (composed primarily of SiO2)

Turquoise

Hydrated phosphate of copper and aluminium: CuAl6(PO4)4(OH)8·4H2O

Coarse-grained Quartz with Feldspar inclusions

Crystalline Quartz (SiO2) with Orthoclase/Plagioclase Feldspar inclusions

Chert (and Petrified Wood)

Silicon Dioxide (SiO2)

Fluorite (Yellow and Multi-color)

Calcium Fluoride (CaF2)

Rough Diamond

Diamond (C)

Yellow Calcite

Calcium Carbonate (CaCO3)

Chert / Jasper

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Chert (variously known as Flint)

Microcrystalline quartz (SiO2)

Red Sandstone

Arenite with iron oxide (Hematite) cement

Granite

Granite (Felsic Plutonic Rock)

Sea Glass

Amorphous Silica (Anthropogenic glass) - SiO2

Quartz

Quartz (Silicon Dioxide, SiO2)

Ametrine

Ametrine (SiO2 - Silicon Dioxide with trace amounts of Iron)

Rose Quartz

Silicon dioxide (SiO2)

Calcite

Calcium Carbonate (CaCO3)

Quartz Pebble

Silicon Dioxide (SiO2)