Mineral And Glass

Black Obsidian

Volcanic Glass (SiO2)

Quartz (Druzy or Chalcedony variant)

Silicon Dioxide (SiO2)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Small tumbled quartz-like pebble

Likely quartz (SiO₂), possibly milky quartz or pale chalcedony

Amethyst Quartz fragment

SiO2 (Silicon Dioxide with Iron impurities)

Polished black stone, possibly obsidian or black jasper

Indeterminate; likely volcanic glass (obsidian, SiO₂) or microcrystalline quartz (jasper, SiO₂)

Polished black mineral or volcanic glass fragment

Indeterminate; possibly obsidian or black tourmaline

Clear Quartz

Silicon Dioxide (SiO2)

Green glassy slag (often sold as “sea glass” or “green obsidian”)

Industrial vitreous slag; primarily amorphous silicate glass, composition variable

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Chert / Flint

Silicon Dioxide (SiO2)

Tumbled amber-colored glassy mineral specimens

Likely citrine or yellow chalcedony; exact identification is uncertain from the photograph

Blue glassy mineral fragment, possibly kyanite or blue quartz

Indeterminate from image; candidates include kyanite (Al₂SiO₅) or blue quartz (SiO₂)

Obsidian

Volcanic glass (SiO2 - Silicon Dioxide)

Polished black stone, likely black obsidian

Obsidian (volcanic glass), primarily rhyolitic silica glass

Rock crystal (clear quartz), possibly cloudy quartz

Quartz, silicon dioxide (SiO₂)

Likely smoky quartz or quartz-rich tumbled fragment

Quartz, silicon dioxide (SiO₂), possibly smoky quartz

White quartz-rich pebble, possibly chalcedony or milky quartz

Quartz (SiO₂), potentially microcrystalline quartz (chalcedony)

Goldstone

Aventurine Glass (Man-made)

Milky quartz

Quartz (silicon dioxide, SiO₂)

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Quartz (Smoky Quartz variant)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Grain)

Silicon Dioxide (SiO2)

Polished mahogany obsidian (likely)

Volcanic glass; rhyolitic obsidian, predominantly amorphous SiO₂

Obsidian

Volcanic glass (SiO2 + impurities)

Obsidian

Obsidian (Volcanic Glass, SiO2 + impurity)

Obsidian

Extrusive igneous volcanic glass (rich in SiO2)

Obsidian

Extrusive igneous volcanic glass

White Quartz Star

Silicon Dioxide (SiO2)

Greenish quartz (likely prase/chalcedony)

Quartz, SiO₂; possibly green chalcedony or chlorite-included quartz

Clear Quartz

Silicon dioxide (SiO2)

White Quartz

Silicon Dioxide (SiO2)

Milky quartz (rough quartz fragment)

Quartz, silicon dioxide (SiO₂)

Beaded gemstone jewelry (likely amethyst, lapis lazuli, and pearl or glass imitation)

Mixed mineral beads; possible quartz (SiO₂) and lazurite-bearing lapis lazuli

Mixed Tumbled Quartz and Chlorite Quartz

Silicon Dioxide (SiO2) with inclusions

Tumbled Quartz

Silicon Dioxide (SiO2)

Quartz-rich rock, possibly milky quartz or quartzite

Quartz (SiO₂), likely with minor iron-oxide or feldspar inclusions

Quartz Mineral

Silicon Dioxide (SiO2)

Blue glass-like gemstone, likely synthetic spinel or glass

Uncertain; possibilities include synthetic cobalt-blue spinel (MgAl₂O₄) or cobalt-colored glass