Metamorphic (Man Made)

Quartz

Silicon Dioxide (SiO2)

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Note on Image Identification: Textile

N/A (Anthropogenic material)

Asphalt aggregate (crushed stone in bitumen)

Artificial composite; predominantly crushed granite, basalt, limestone, and/or recycled aggregate bound by bitumen

Nephrite Jade

Ca2(Mg, Fe)5Si8O22(OH)2

Gneiss

Gneiss (High-grade regional metamorphic rock)

Orthoclase Feldspar (or K-Feldspar)

Orthoclase (KAlSi3O8)

Hematite

Hematite (Fe2O3)

Quartzite

Quartzite (primarily SiO2)

Quartz

Silicon Dioxide (SiO2)

Mica-rich metamorphic rock, likely schist

Muscovite–biotite schist, possibly with quartz and feldspar

Granite

Granite (a common rock name, not a single mineral species, composed primarily of quartz, feldspar, and mica/amphibole)

Quartz (Float/Abraded)

Quartz (SiO₂)

Tumbled metamorphic pebble, likely gneiss

Foliated gneiss; commonly quartz, feldspar, mica, and amphibole

Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Porphyritic Andesite or Basalt

Porphyritic Intermediate/Mafic Igneous Rock

Unidentified Rock Fragment

Unknown

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Rose Quartz

Rose Quartz (SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi3O8)

Banded metamorphic rock, likely gneiss

Biotite–quartz–feldspar gneiss, possibly migmatitic

Amphibolite / Hornblende Schist

Amphibolite

Seraphinite

Clinochlore (Mg,Fe)5Al(AlSi3O10)(OH)8 - specific variety for Seraphinite due to its fibrous inclusions and chatoyancy.

Concrete or asphalt-like aggregate surface with a dark fragment

Uncertain; likely artificial concrete containing mixed lithic aggregate, not a natural rock

Quartzite

Quartzite

Pearl (Biogenic Mineraloid)

Calcium carbonate (CaCO3) primarily as Aragonite

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Quartz (SiO₂)

Quartz (likely) or a Quartzite Pebble

Silicon dioxide (SiO2) for quartz. If it's quartzite, it's a metamorphic rock primarily composed of quartz.

Quartz

Quartz (SiO₂)

Banded Iron Formation

Banded Iron Formation (BIF)

Quartz (likely milky quartz or a stained variety)

Silicon Dioxide (SiO₂)

Tumbled gneiss

Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals

Likely weathered mica schist fragment

Mica schist, chiefly muscovite/biotite mica with quartz and feldspar

Biotite Mica

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

Quartz (beads)

SiO2 (Silicon Dioxide)

Mica schist

Muscovite–biotite schist, commonly with quartz and feldspar

Diamond (Cut Gemstone)

Carbon (C)

Chert

Chert (Microcrystalline Quartz)

Sandstone

Arenite (mostly SiO2)

Quartz

Quartz (Silicon Dioxide - SiO2)

Pearl

Calcium carbonate (CaCO3) - mainly Aragonite with Conchiolin