Industrial Byproduct (Often Confused With Igneous Rocks Or Meteorites)

Quartz Pebble

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

Amazonite

K(AlSi3O8) - Microcline variant

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Granite Cobble

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Scoria

Vesicular Basalt / Scoriaceous Basalt

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Basalt (Vesicular)

Mafic Volcanic Rock (rich in Magnesium and Iron)

Quartz (milky variety)

SiO2 (Silicon Dioxide)

Magnetite / Iron-Rich Concretion

Magnetite (Fe3O4) or Bog Iron Limonite

Obsidian

Volcanic glass (high silica content based on SiO2)

Carnelian

Carnelian (Microcrystalline Quartz, SiO2 with Fe2O3 impurities)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Agate

Silicon Dioxide (SiO2) - Chalcedony variant

Pyrite

Iron Sulfide (FeS2)

Pyrite (Cube variety)

Iron Sulfide (FeS2)

Blue Lace Agate

Chalcedony (SiO2) with trace minerals

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Aquamarine

Beryl (Be3Al2Si6O18)

Carnelian Agate

Carnelian (Silicon Dioxide - SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Blue Lace Agate (often dyed)

Silicon dioxide (SiO2) - variety of chalcedony

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Smoky Quartz

Smoky Quartz (Silicon Dioxide - SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Amazonite

Potassium Feldspar (KAlSi3O8)

Granite

Granite (a felsic intrusive igneous rock)

Granite

Granite (Felsic intrusive igneous rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt (Vesicular)

Extrusive mafic igneous rock; primarily (Ca, Na)(Mg, Fe, Al)(Si, Al)2O6 with (Ca, Na)(Al, Si)4O8

Ferruginous Quartz (Iron-stained Quartz)

Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)

Milky Quartz

Silicon Dioxide (SiO2)

Eclogite

Eclogite (Omphacite-Garnet rock)

Amygdaloidal Basalt

Amygdaloidal Basalt (extrusive volcanic rock with mineral inclusions)

Quartz (River Pebble)

Quartz (Silicon Dioxide - SiO2)

Lava Rock (Scoria)

Scoria (highly vesicular basaltic rock)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Diabase (also known as Dolerite)

Diabase / Dolerite

Smoky Quartz

Silicon Dioxide (SiO2) with aluminum impurities