Mineral And Glass

Yellow Jasper

Chalcedony (Silicon Dioxide with Iron inclusions), SiO2

Orthoclase Feldspar

Potassium aluminum silicate (KAlSi3O8)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Obsidian with Cristobalite

Volcanic Glass (Amorphous Silicon Dioxide) with Cristobalite inclusions

Obsidian (Apache Tear)

Volcanic Glass (High-silica Rhyolite)

Green Aventurine

SiO2 (Quartz) with inclusions of Fuchsite

Green Aventurine (Tumbled Quartz)

Silicon Dioxide (SiO2) with inclusions of Fuchsite (K(Al,Cr)3Si3O10(OH)2)

Mahogany Obsidian

Volcanic Glass with Hematite inclusions (SiO2)

Mahogany Obsidian

Obsidian (Volcanic Glass with Hematite/Magnetite inclusions), SiO2

Obsidian

Volcanic Glass (70-75% SiO2 with MgO and Fe3O4)

Black Obsidian

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

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Obsidian

Obsidian (principally SiO2 + MgO, Fe3O4)

Obsidian

Obsidian (Volcanic Glass, SiO2 dominated)

Quartz Pebble

Silicon Dioxide (SiO2)

Smoky Quartz occurring with Feldspar

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate (KAlSi3O8)

Quartz Pebble (with probable inclusions or staining)

Quartz (Silicon Dioxide - SiO2)

Sapphire (Blue)

Corundum (Al2O3)

Quartzite

Quartzite (primarily SiO2)

Sandstone (Iron-stained)

Arenite with Limonite/Hematite staining

Sandstone (with Limonite/Iron Staining)

Arenite (SiO2 based) with FeO(OH) staining

Milky Quartz

Silicon Dioxide (SiO2)

Pink Feldspar (Orthoclase)

Orthoclase Feldspar (KAlSi3O8)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Sandstone (likely Fossiliferous)

Arenite / Fossiliferous Sandstone (SiO2 composition)

Red Sandstone

Arenite (Ferruginous Sandstone)

Black Obsidian

Obsidian (Amorphous Silicon Dioxide)

Fluorite

Calcium Fluoride (CaF2)

Rough Apatite in Matrix

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

Massive White Quartz

Silicon Dioxide (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Quartz (Iron-Stained or Milky Quartz)

Silicon Dioxide (SiO2)

Polished mahogany obsidian (probable)

Volcanic glass; chiefly rhyolitic silica-rich glass (SiO₂), compositionally near rhyolite

Sandstone (with Iron Staining)

Clastic sedimentary rock (primarily Quartz with Limonite/Goethite staining)

Obsidian

Obsidian (Volcanic Glass, SiO2)

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Smoky Quartz (Polished)

Silicon Dioxide (SiO2)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)