Igneous Or Sedimentary (Anthropogenic Modification)

Banded Sedimentary Rock

Sedimentary rock with Liesegang banding

Dark gray igneous rock, likely basalt

Basalt; fine-grained plagioclase–pyroxene rock, commonly with minor olivine and magnetite

Coarse-grained gray igneous rock, likely granite or granodiorite

Granite–granodiorite; chiefly quartz, feldspar, and dark mica/amphibole

Tumbled dark igneous rock, likely basalt

Basalt; commonly composed of plagioclase feldspar, pyroxene, and olivine

Sandstone or Mudstone

Sedimentary Rock

Quartz (likely macrocrystalline variety)

Quartz (SiO₂)

Granite

Intrusive Igneous Rock

Possible dark igneous rock

Indeterminate; likely basalt or fine-grained mafic rock

Banded Igneous Dike Rock

Intrusive igneous rock with felsic/mafic banding

Porphyritic Igneous Rock / Basalt or Andesite Xenolith in Granite or Quartzite

Silicate rock with contrasting xenolith/inclusion

Granite

Granite

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Gabbro

Gabbro

Gabbro (Water-worn Pebble)

Gabbro

Weathered quartz-rich rock, possibly granite or pegmatite fragment

Uncertain; likely quartz–feldspar aggregate, potentially granitic pegmatite

Dalmatian Jasper

Microcrystalline Quartz with Arfvedsonite and Tourmaline inclusions

Granite Pebble

Granite

Granitoid (Common Granite/Gneiss)

Granitoid (primarily Quartz [SiO2], Feldspar [KAlSi3O8], and Mica)

Granite

Phaneritic Plutonic Igneous Rock

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Granite

Granite (Phaneritic Quartz-Feldspar Plutonic Rock)

Milky Quartz in Epidote Host Rock

Crystalline Silicon Dioxide (SiO2) with Epidote Ca2(Al,Fe)3(SiO4)3(OH)

Granite

Phaneritic plutonic felsic rock (primarily Quartz, Feldspar, and Mica)

Granite fragment

Granite (Felsic Plutonic Rock)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Granite and Igneous Mix

Phaneritic Felsic to Mafic Intrusive Rocks

Granite

Granite (composed primarily of Quartz, Potassium Feldspar, Plagioclase Feldspar, and Biotite/Mica)

Sandstone

Arenite

Shale / Mudstone

Laminated Mudrock (Siliciclastic Sedimentary Rock)

Shale (Beach-worn)

Laminated Pelite (primarily clay minerals and quartz)

Granite Pebble (Pink/Orthoclase Granite)

Granite

Granite

Granite (composed of Quartz, Feldspar, and Mica)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Rose Quartz

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

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Nephrite Jade

Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Sandstone (Quartz-rich)

Arenite (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)