Mineral (Gemstone)

Rose Quartz

Quartz (Silicon Dioxide - SiO2) with trace impurities of Titanium, Manganese, or Iron

Chalcedony

Cryptocrystalline Quartz (SiO2)

Sunstone

Plagioclase Feldspar (Na,Ca)(Al,Si)4O8

Crystalline Quartz (Rough)

Quartz (Silicon Dioxide, SiO2)

Black Obsidian with white veins

Volcanic Glass (70–75% SiO2)

Amethyst

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz (Clear Quartz and Rose Quartz variants)

Silicon Dioxide (SiO2)

Red Garnet (likely Almandine or Pyrope)

Garnet group: X3Y2(SiO4)3 (e.g., Almandine: Fe3Al2Si3O12)

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Clear Quartz Crystal

Quartz (Silicon Dioxide - SiO2)

Quartz (Milky and Bull Quartz)

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Amazonite

Amazonite (KAlSi3O8 – a variety of Microcline, a Potassium Feldspar)

Sunstone

Plagioclase Feldspar (specifically Oligoclase variety containing hematite or goethite inclusions)", composition: (Ca,Na)(Al,Si)2Si2O8

Blue Kyanite

Kyanite (Al2SiO5)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Moonstone (bead form)

Potassium Aluminum Silicate (KAlSi3O8) - a variety of Orthoclase Feldspar

Amygdaloidal Basalt

Basalt with secondary mineral infilling

Turquoise

Turquoise - CuAl6(PO4)4(OH)8·4H2O

Moonstone (Feldspar)

Orthoclase or Oligoclase (KAlSi3O8)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Obsidian (specifically Mahogany Obsidian)

Volcanic glass (high silica content, SiO2)

Obsidian

Volcanic Glass (70-75% SiO2)

Red Jasper (Chert)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Green Aventurine

Quartzite with Fuchsite inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Jasper (specifically Picture Jasper or Landscape Jasper)

Silicon Dioxide (SiO2) - Opaque variety of Chalcedony/Quartz

Quartz

Silicon Dioxide (SiO2)

Stichtite in Serpentine (Atlantisite)

Mg6Cr2CO3(OH)16·4H2O (Stichtite) within Mg3Si2O5(OH)4 (Serpentine)

Amethyst

Amethyst (Silicon Dioxide - SiO2 with Iron impurities)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz in Matrix (possibly Basalt or Siltstone host)

Silicon Dioxide (SiO2) in Host Rock

Peridot

Olivine (Mg,Fe)2SiO4

Quartz (Common or Milky)

Silicon Dioxide (SiO2)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Chrysocolla

Hydrated copper phyllosilicate, Cu2-xAlx(H2-xSi2O5)(OH)4·n(H2O)

Peridot (likely, based on color and appearance)

Olivine group mineral, specifically (Mg,Fe)2SiO4 (Forsterite-Fayalite solid solution series)

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Jasper (var. Ocean or Polychrome Jasper)

Silicon Dioxide (SiO2) with iron and mineral inclusions