Mixed (Sedimentary, Igneous, And Metamorphic)

Diopside (likely Chromian Diopside)

Diopside, part of Clinopyroxene family of inosilicates. Chemical formula: CaMgSi2O6. The green variety is often Chromian Diopside due to chromium impurities.

Ruby (in a ring setting)

Corundum (Al2O3:Cr)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Mica (Lepidolite or Muscovite)

Phyllosilicate mineral (KAl2(AlSi3O10)(OH)2 for Muscovite)

Garnet (Almandine)

Almandine (Fe3Al2(SiO4)3)

Biotite (Mica)

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

Epidote in Quartz (Epidosite)

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)

Almandine Garnet

Almandine (Fe3Al2(SiO4)3)

Mixed Tumbled Quartz and Chlorite Quartz

Silicon Dioxide (SiO2) with inclusions

Quartz Pebble

Silicon Dioxide (SiO2)

Shale or Argillite

Shale (sedimentary) / Argillite (metamorphic)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Brick

Fired clay or Ceramic material (no specific mineralogical scientific name as it's a composite)

Epidote

Calcium aluminum iron silicate hydroxide (Ca2(Al,Fe)3(SiO4)3(OH))

Greenstone / Serpentinite

Serpentine-group / Altered Mafic Rock

Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Kyanite

Kyanite (Al2SiO5)

Mica Schist

Mica Schist

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Greenschist

Greenschist (containing Chlorite, Epidote, and Actinolite)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Quartz Veined Mudstone

Metasedimentary rock with Quartz (SiO2) veins

Rose Quartz

Rose Quartz (SiO2)

Biotite Mica

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

Weathered quartz-rich cobble, possibly quartzite or feldspar-rich granite

Quartz–feldspar aggregate; identification is uncertain from the photograph

Sapphire

Corundum (Al2O3)

Prehnite

Calcium aluminum silicate hydroxide, Ca2Al(AlSi3O10)(OH)2

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Yellow Aventurine

Quartz (Silicon Dioxide, SiO2) with inclusions

Blue Apatite

Fluorapatite / Apatite Group (Ca5(PO4)3(F,Cl,OH))

Milky Quartz

Silicon Dioxide (SiO2)

Iron-stained Quartz

Silicon Dioxide with Iron Oxide (SiO2 with Fe2O3)

Muscovite Mica

Muscovite - KAl2(AlSi3O10)(F,OH)2

Milky Quartz

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl)

NaFe3+3Al6(BO3)3Si6O18(OH)4

Corundum (Sapphire / Raw Sapphire)

Aluminum Oxide (Al2O3)