Metamorphic Rock (Specifically A Rock Composed Of Minerals)

Greenschist

Greenschist (Chlorite-actinolite schist)

Schist (Garnet-Mica Schist)

Garnet-Mica Schist

Schist

Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)

Man-made Jewelry (Metal and Glass/Plastic)

Synthetic Alloy and Amorphous Solid (SiO2/Polymer)

Note: Item is not a geological specimen

Guitar Components (Steel, Nickel, Plastic, Wood)

Slate

Slate (Foliated metamorphic rock)

Granite (Dioritic variant)

Phaneritic Felsic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Sandstone

Arenite (primarily SiO2)

Sandstone

Arenite (Clastic Sedimentary Rock)

Sandstone

Arenite (primarily SiO2)

Unakite

Unakite (Altered Granite composed of Orthoclase KAlSi3O8, Epidote Ca2(Al, Fe)3(SiO4)3(OH), and Quartz SiO2)

Sandstone (likely Quartzose)

Sandstone (Principally SiO2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)

Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)

Sandstone

Sandstone (various mineral compositions)

Gneiss

High-grade regional metamorphic rock (Foliated)

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Red Sandstone

Clastic Terrigenous Sedimentary Rock (composed mostly of SiO2 with Fe2O3)

Biotite Schist

Biotite Schist

Sandstone

Arenite (SiO2 based)

Gneiss (Metamorphic Rock)

Gneiss

Basalt with Epidote Veins

Mafic Igneous Rock (Basalt)

Sandstone

Arenite (composed mainly of SiO2)

Agate (specifically a Yellow/Honey Agate)

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Amethyst (Rough)

Silicon Dioxide with iron impurities (SiO2)

Granite Gneiss

Gneiss (High-grade metamorphic rock)

Basalt

Extrusive Mafic Igneous Rock

Graphic Granite (Zebra Rock)

Pegmatitic Granite (composed of Quartz and K-Feldspar)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Gneiss

Gneiss

Chert (specifically Banded Chert)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Sandstone

Arenite (SiO2 based with various mineral cements)

Sandstone

Arenite (composed primarily of SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Basalt

Mafic volcanic rock, primarily composed of Plagioclase, Pyroxene, and Olivine

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Dalmatian Stone (commonly Dyed)

Dalmatian Jasper (Peralkaline igneous rock)

Serpentinite

Serpentinite (group of hydrous magnesium iron phyllosilicates)

Granite

Granite (a common rock type, not a single mineral species)

Sandstone

Arenite (composed primarily of SiO2)