Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Sandstone

Arenite

Clay Brick

Ceramic structural unit (Al2O3·2SiO2·2H2O as precursor)

Concretion or Geode (unbroken)

Varied (depending on mineral composition and cementing agent). For quartz-lined geodes, the scientific name of the dominant mineral would be Quartz (SiO2). For calcite-lined geodes, Calcite (CaCO3). Concretions are often composed of cryptocrystalline quartz (chert), calcite, or iron oxides.

Granite Pebble

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

Quartz Vein in Schist

Quartz (SiO2) in Mica Schist

Quartz (specifically Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Sandstone

Arenite (Sedimentary rock comprising sand-sized grains)

Gneiss

Gneiss (High-grade metamorphic rock)

Banded Gneiss

Gneiss (complex metamorphic silicate rock)

Ocean Jasper

Spherulitic Chalcedony (SiO2)

Sandstone

Arenite

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Mica Schist

Muscovite/Biotite Schist

Unakite

Epidotized Granite

Amethyst (Chevron Amethyst)

Amethystine Quartz (SiO2)

Sandstone

Quartz Arenite (a type of sandstone composed of more than 90% quartz)

Schist with Quartz/Mica

Mica Schist (primarily Muscovite and Quartz)

Sandstone

Arenite

Sandstone

Arenite (SiO2 based)

Biotite Schist with Garnet

Garnet-Biotite Schist

Mica Schist

Mica Schist (primarily Muscovite and Biotite KAl2(AlSi3O10)(OH)2)

Fire Opal (in matrix)

Hydrated Silica (SiO2·nH2O)

Quartz

Silicon Dioxide (SiO2)

Gneiss

Gneiss (High-grade Metamorphic Rock)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2) or Jadeite (Na(Al,Fe3+)Si2O6)

Granite Gneiss

Felsic Gneiss

Sandstone (likely Quartzose Sandstone)

Arenite (composed primarily of SiO2)

Sandstone (Quartzose)

Arenite (composed primarily of SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Sandstone (Ferruginous)

Arenite (with Iron Oxide cement)

Sandstone (Quartzose)

Arenite (SiO2 based)

Schist (Micaceous Schist)

Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)

Sandstone (with prominent jointing/fractures)

Arenite (composed primarily of SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions

Vesicular Basalt (Scoria)

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Blue Apatite

Apatite - Ca5(PO4)3(F,Cl,OH)

Sandstone

Sandstone (lithified sand)

Gneiss

Gneiss

Basalt

Basalt (composition of plagioclase feldspar and pyroxene)