Quartzite

Quartzite (primarily SiO2)

metamorphic

Ferruginous Sandstone

Arenite with Iron Oxide matrix (Fe2O3)

sedimentary

Jadeite Jade

NaAlSi2O6 (Sodium Aluminum Silicate)

metamorphic

Jadeite (Jade)

Jadeite; NaAlSi2O6

metamorphic

Basalt (Stream-worn Cobble)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

igneous

Porphyry

Porphyritic Andesite/Dacite

igneous

Graphic Granite

Pegmatitic Feldspar with Quartz intergrowths

igneous

Unakite

Unakite Lepidolite

metamorphic

Orbicular Granite (specifically Mustard or Yellow Tonalite/Granodiorite)

Orbicular Quartz Diorite / Tonalite

igneous

Unakite

Epidotized Granite

metamorphic

Granite Gneiss

Gneiss (High-grade Metamorphic Rock)

metamorphic

Granite

Phaneritic Igneous Rock (Granitic)

igneous

Granite

Granite (Phaneritic intrusive igneous rock)

igneous

Petrified Wood

Silicified wood (Quartz/Chalcedony replacement of organic matter)

sedimentary

Pink Granite

Phaneritic Felsic Intrusive Igneous Rock

igneous

Pink Quartzite

Quartzite (primarily SiO2)

metamorphic

Ruby (Corundum)

Al2O3 (Aluminium oxide with Chromium impurities)

Mineral

Granite (specifically Rapakivi Granite)

Phaneritic Felsic Igneous Rock (Granite)

igneous

Mahogany Obsidian

Volcanic Glass with Hematite/Magnetite inclusions

igneous

Ambergris

Physeter macrocephalus excreta (Ambergris)

mineraloid / organic geological find

Mammoth Tooth Fragment

Mammuthus primigenius (fossilized dentin and enamel)

sedimentary

Ferruginous Sandstone (Gozzan)

Iron-rich clastic sedimentary rock with Limonite/Goethite

sedimentary

Specular Hematite

Specularite (Fe2O3)

mineral

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

metamorphic

Orbicular Granite

Orbicular Granidiorite / Plutonic Igneous Rock

igneous

Jasper with Hematite inclusions

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)

sedimentary

Granite

Phaneritic intrusive igneous rock (composition: Quartz, Alkali Feldspar, Plagioclase Feldspar)

igneous

Epidote-bearing Granite (Unakite-like)

Epidotized Granite

igneous

Granite

Phaneritic Plutonic Felsic Rock (Granite)

igneous

Pegmatite

Pegmatitic Granite

igneous

Granite

Phaneritic Igneous Rock (Granite)

igneous

Corundum (Ruby/Sapphire crystal)

Al2O3 (Aluminum Oxide)

mineral

Eclogite

Eclogite (composed primarily of Omphacite and Pyrope Garnet)

metamorphic

Basalt

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

igneous

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

metamorphic

Diamond in Kimberlite

Kimberlite Matrix with Carbon (Diamond)

igneous

Quartz Geode Fragment

Silicon Dioxide (SiO2)

sedimentary

Dacite

Dacite (Intermediate volcanic rock)

igneous

Garnet Rhyolite

Rhyolite (high-silica volcanic rock) with almandine/spessartine garnet

igneous

Carnelian Agate

Silicon Dioxide (SiO2) - variety of Chalcedony

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

White Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

mineral