Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Amygdaloidal Rhyolite (often called Lake Superior Agate relative)

Rhyolite with Calcite/Quartz amygdules (SiO2 and secondary minerals)

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Granite (a common rock type, not a single mineral species)

Sodalite

Sodalite [Na8(Al6Si6O24)Cl2]

Mixed Gemstone Bracelet

Mixed natural minerals and rocks (e.g., Rhodonite, Malachite, Sodalite, Rose Quartz, Black Tourmaline, Quartz/Chalcedony variants)

Greenstone Celt (Polished Stone Axe)

Metamorphosed mafic rock (often Basalt or Diabase)

Banded Agate (specifically Mexican Lace Agate variety appearance)

Silicon Dioxide (SiO2 / Chalcedony)

Quartz (Water-worn pebble)

Silicon Dioxide (SiO2)

Arkosic Sandstone

Arkose

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Carnelian Agate (with Quartz/Chalcedony)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Rose Quartz

Quartz (Silicon Dioxide) - SiO2

Smoky Quartz

SiO2 (Silicon Dioxide)

Gneiss

Gneiss (High-grade metamorphic rock composed primarily of Quartz, Feldspar, and various Micas)

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Amazonite

Amazonite (KAlSi3O8, a variety of Microcline)

Greenschist

Chlorite-actinolite schist

Scoria (Lava Rock)

Scoria (Extrusive Igneous Rock / Mafic Silicates)

Lepidolite Bracelet

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2) often in Quartz matrix

Blue Kyanite

Kyanite (Al2SiO5)

Amphibolite with Hornblende

Amphibole-rich Metamorphic Rock (Ca2(Mg,Fe)5Si8O22(OH)2)

Granite

Granite (felsic intrusive igneous rock)

Labradorite (Larvikite variety)

(Na,Ca)(Al,Si)4O8 (Plagioclase Feldspar)

Amethyst

Amethyst (Silicon Dioxide, SiO2 + Fe)

Quartz Pebble

Silicon Dioxide (SiO2)

Milky or Iron-Stained Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky or Iron-Stained)

Silicon Dioxide (SiO2)

Gneiss

Gneissic Metamorphic Rock

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Granite Cobble

Granite (Phaneritic Quartz-Feldspar Felsic Rock)

Iron-stained Milky Quartz

Silicon Dioxide (SiO2) with iron oxide inclusions

Rose Quartz

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

Granite

Granite (Mainly Quartz SiO2, K-Feldspar KAlSi3O8, and Plagioclase)

Rose Quartz

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

Basalt (River Pebble)

Basalt (extrusive mafic rock)

Quartz Geode

Silicon Dioxide (SiO2)

Basalt

Basalt (Mafic volcanic rock)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Banded Gneiss

Gneiss (pronounced "nice")

Blue Calcite

Calcium Carbonate (CaCO3)