Man Made Metamorphic Style Composite

Amethyst

Amethyst (Silicon Dioxide - SiO2 with iron impurities)

Gneiss

Gneiss (a rock type, not a specific mineral with a formula)

Clear Quartz

Silicon Dioxide (SiO2)

Unakite

Epidotized Granite

Amygdaloidal Rhyolite

Amygdaloidal Rhyolite (Felsic volcanic rock)

Greenstone

Greenschist (metamorphosed mafic igneous rock)

Serpentine pendant

Serpentinite; chiefly antigorite, lizardite, or chrysotile Mg₃Si₂O₅(OH)₄

Serpentine-rich metamorphic stone

Serpentinite, chiefly serpentine-group minerals (antigorite, lizardite, or chrysotile) with possible quartz, magnesite, and magnetite

BROWN GRANITE (likely 'Tan Brown' or similar)

Granite (specifically a variety rich in orthoclase feldspar, often with biotite and possibly hornblende)

Polished serpentine or green jasper pebble

Likely serpentine-group silicate, chiefly antigorite/lizardite; possibly iron-rich jasper

Granite (weathered pebble)

Granite (plutonic igneous rock)

Quartzite

Quartzite (primarily SiO2)

Greenstone

Greenschist

Greenstone

Metabasalt (Greenstone facies)

Greenstone (Greenschist)

Greenschist (composed of Chlorite, Epidote, and Actinolite)

Agate

Agate (Silicon Dioxide, SiO2)

Quartzite River Rock

Quartzite (SiO2)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz-rich gneiss

Banded quartz–feldspar–mica gneiss; commonly containing biotite and muscovite

Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Phyllite (possibly low-grade greenish slate)

Foliated metamorphic rock composed mainly of very fine-grained quartz, mica, and chlorite; approximate composition varies and has no single fixed chemical formula

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely ferruginous milky quartz

Quartzite Pebble (River Rock)

Quartzite (primarily SiO2)

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Yellow Quartz (possibly dyed)

Silicon Dioxide (SiO2)

Serpentine with quartz or calcite vein

Serpentinite; mainly serpentine-group minerals (Mg₃Si₂O₅(OH)₄), with a pale quartz/calcite vein

Banded Iron Formation (BIF) / Tiger Iron

Ferruginous Chert (primarily Quartz [SiO2] and Hematite/Magnetite [Fe2O3/Fe3O4])

Red Quartzite Cobble

Quartzite (primarily SiO2)

Quartzite

Quartzite (primarily SiO2)

Quartz (likely Jasper or Chert variety)

Quartz (SiO₂)

Greenstone

Protolith of basalt/gabbro (chlorite-epidote metamorphic facies)

Quartzite

Quartzite (Primary mineral: Quartz, SiO2)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

Tumbled green-and-white stone, likely serpentine

Serpentinite; mainly serpentine-group minerals, Mg₃Si₂O₅(OH)₄, with possible magnesite or talc

Quartz

Quartz (SiO2 - Silicon Dioxide)

Quartzite

Quartzite (SiO2)

Sandstone

Sandstone (clastic sedimentary rock composite)

Coquina

Bioclastic Limestone

Tumbled serpentine

Serpentinite; chiefly serpentine-group minerals, Mg3Si2O5(OH)4