Synthetic Polymer (Synthetic Material)

Dendritic Agate (or Dendritic Opal)

SiO2 (for Agate), SiO2·nH2O (for Opal)

Biotite Schist

Biotite Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)

Mica Schist

Mica Schist (Complex Silicate Rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

River Quartzite Spheroid

Recrystallized Orthoquartzite (SiO2)

Titanium Coated Kyanite (Aura Kyanite)

Aluminosilicate (Al2SiO5) with a Titanium-Niobium vacuum-deposited coating

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Diamond

Diamond (C)

Obsidian

Volcanic glass

Diamond (Rough)

Diamond (C)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Granite

Granite (a common rock type, not a single mineral with a formula. Composed primarily of quartz, feldspar, and mica/amphibole).

Pebble or Cobble (likely composed of sandstone or conglomerate)

Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)

Red Jasper

Red Jasper (variety of Chalcedony, SiO₂)

Diamond

Diamond (C)

Quartzite

Quartzite (primarily SiO2)

Chert (often called Flint when dark)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartzite (Milky Quartz Cobble)

Silicon Dioxide (SiO2)

Granite

Granite (felsic intrusive igneous rock)

Unakite

Unakite (Epidote-Feldspar rock)

Black Star Diopside (beads)

Diopside (CaMgSi2O6) - a member of the pyroxene group

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Chert (Nodule)

Microcrystalline Quartz (SiO2)

Ferruginous Quartz (Iron-stained Quartz)

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Laterite (iron-rich nodule, possibly Bauxite as a subtype)

Laterite (composed of various minerals including goethite, hematite, gibbsite, etc.)

Halite

Sodium Chloride (NaCl)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Coquina

Biogenic Limestone (Calcite, CaCO3)

Rhodonite

Rhodonite (MnSiO3)

Chert (specifically Flint or Common Chert node)

Silicon Dioxide (SiO2)

Anthracite Coal

Anthracite (Carbon Content: 86%–98%)

Sodalite

Sodalite, Na8(Al6Si6O24)Cl2

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Rose Quartz

Quartz (SiO₂), specifically a variety of Quartz

Chert (or Flint)

Chert (a cryptocrystalline variety of quartz, SiO2)

Gold (Processed)

Gold (Au)

Labradorite (a variety of Anorthosite or Plagioclase)

Labradorite (member of Plagioclase Feldspar series), (Ca,Na)(Al,Si)4O8

Kyanite (Blue Kyanite)

Kyanite (Al2SiO5)

Basalt with Scoria/Vesicular Texture

Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)

Sandstone (specifically Arkose or Quartz Arenite)

Arenite (primarily SiO2 with possible Feldspar)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Rose Quartz

Silicon Dioxide with traces of Titanium, Iron, or Manganese (SiO2)