Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Blue Sapphire

Corundum (Al2O3)

Basalt Breccia

Volcanic Breccia (composed of basaltic clasts in a fine-grained matrix)

Basalt Pebble

Basalt

River Pebble (Granite/Sandstone Pebble)

Rounded Quartz/Feldspar Gravel Clast

Basalt

Extrusive Igneous Rock

Basalt

Mafic Igneous Rock

Granodiorite / Granite

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Talc Schist / Soapstone

Talc (Mg3Si4O10(OH)2)

Marble

Metamorphic carbonate rock (primarily CaCO3)

Quartzite

Quartzite (SiO2 based)

Red Quartzite

Metamorphic Quartzite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Diorite (River Cobble)

Intrusive Igneous Diorite

Quartzite

Quartzite (SiO2-rich metamorphic rock)

Biotite (Black Mica)

Biotite - K(Mg,Fe)3(AlSi3O10)(OH)2

Basalt Pebble

Basalt (Mafic Extrusive Igneous Rock)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Granite

Phaneritic Plutonic Felsic Rock (SiO2, KAlSi3O8, NaAlSi3O8)

Basalt pebble

Aphanitic Mafic Volcanic Rock (Fe/Mg rich)

Granite

Granite

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granodiorite

Phaneritic Plutonic Intermediate-Felsic Rock

Pink Granite

Phaneritic intrusive igneous rock (high Orthoclase Feldspar content)

Pink Granite

Granite (Phaneritic igneous rock rich in Orthoclase)

Granite

Granite (Phaneritic intrusive igneous rock)

Quartz Vein in Host Rock

Silicon Dioxide (SiO2) within Sedimentary/Metamorphic Matrix

Dalmatian Stone

Dalmatian Jasper (a trade name for an igneous microcrystalline rock composed mostly of feldspar, quartz, and dravite)

Basalt with Epidote (Greenstone)

Epidote-bearing Metabasalt

Quartz with Mica inclusions (likely Schist or Gneiss host)

Silicon Dioxide (SiO2) with Phyllosilicates (KAl2(AlSi3O10)(OH)2)

Basalt

Mafic volcanic rock (primarily plagioclase feldspar and pyroxene)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartz Geode (with possible Manganese or Goethite coating)

Silicon Dioxide (SiO2)

Pink Granite (Alkali Feldspar Granite)

Granite (rich in Potassium Feldspar / Orthoclase)

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Slag (Industrial Glassy Byproduct)

Ferro-silicate Slag

Black Granite (Basalt or Gabbro)

Mafic Igneous Rock (primarily Plagioclase and Pyroxene)

Granite

Phaneritic Felsic Igneous Rock

Granite

Intrusive igneous felsic rock

Granite

Granite (Felsic Plutonic Rock)

Chert (Arrowhead variety)

Chert (SiO2)

Quartzite

SiO2 (Quartzite)