Mineral (Silicate Variety)

Sandstone

Arenite

Moss Agate

Silicon Dioxide (SiO2) with inclusions of Manganese or Iron oxide

Sodalite in Matrix (Sunset Sodalite)

Sodalite Na8(Al6Si6O24)Cl2

Gneiss (specifically a weathered Amphibolite or Garnet Gneiss)

Gneiss (complex silicate composition)

Banded Iron Formation (BIF)

Banded Iron Formation (predominantly Hematite Fe2O3 and Magnetite Fe3O4 with Chert SiO2)

Mica Schist / Granite

Mica Schist (Silicate metamorphic rock)

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Peach Moonstone

Potassium Aluminum Silicate (KAlSi3O8) with inclusions

Copper Ore (Malachite, Azurite, and Chalcopyrite in Host Rock)

Copper-bearing polymetallic mineral aggregate (Cu-minerals)

Eudialyte in Matrix

Eudialyte [Na15Ca6(Fe,Mn)3Zr3(Si25O73)(O,OH,H2O)3(Cl,OH)2]

Sandstone

Arenite

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Limonite (Ironstone)

Limonite (mixture of hydrated iron oxides, primarily Goethite α-FeO(OH))

Quartz-rich river pebble (likely milky quartz or quartzite)

Quartz, SiO₂; possibly quartzite, a metamorphic rock dominated by quartz

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Nephrite Jade

Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Bauxite

Bauxite (Al(OH)3, γ-AlO(OH), and α-AlO(OH))

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Bauxite (Iron-stained Chert / Ironstone Aggregate)

Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))

Weathered tan mineral/rock fragment

Indeterminate from image; possibly iron-stained quartz, feldspar-rich rock, or limonite-bearing material

Granite

Intrusive Igneous Rock

Serpentinite

Serpentinite (Hydrated Magnesium Silicate Mg3Si2O5(OH)4)

Siltstone or Sandstone Pebble

Lithic Arenite / Quartzose Siltstone

Small gray rock fragment

Indeterminate; possibly quartz-rich granite, chert, or concrete-like silicate material

Quartz Pebble

Silicon Dioxide (SiO2)

Rose Quartz

Silicon Dioxide (SiO2)

Obsidian

Obsidian (Volcanic Glass, complex silicate)

Labradorite (Polished Sphere)

(Ca, Na)(Al, Si)4O8 (Silicate mineral)

Mammoth or Mastodon Tooth Fossil

Mammuthus / Mammut tooth

White Jade (Nephrite or Jadeite)

Tremolite-Actinolite series (Nephrite) or NaAlSi2O6 (Jadeite)

Chakra Tumbled Stone Set

Various (including Amethyst [SiO2], Sodalite [Na8(Al6Si6O24)Cl2], Green Aventurine [SiO2], Red Jasper [SiO2], etc.)

Bumblebee Jasper (technically Bumblebee Stone)

Calcite, Aragonite, and Realgar/Orpiment mixture (SiO2 + CaCO3 + As2S3/As2S2)

Diorite

Diorite (an intrusive igneous rock)

Bauxite

Alumina-rich rock (consisting of Gibbsite, Boehmite, and Diaspore)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Moss Agate / Green Jasper

Silicon Dioxide (SiO2) with chlorite/hornblende inclusions

Amethyst

Silicon Dioxide (SiO2) with trace Iron (Fe3+)

Eudialyte in Matrix

Na15Ca6Fe3Zr3Si26O72(OH,Cl,H2O)3

Amazonite

Potassium aluminum silicate (Microcline); KAlSi3O8

Chrysocolla

Chrysocolla: Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nHeO)