Mineral And Glass

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite/Limonite

Tumbled yellow quartz (likely citrine or iron-stained quartz)

Quartz, silicon dioxide (SiO₂), yellow coloration from iron impurities

Rose Quartz

Silicon dioxide (SiO2) with trace impurities of titanium, iron, or manganese

Quartz pebble

Silicon dioxide (SiO2)

Red glassy mineral specimen, likely synthetic ruby or red spinel

Most consistent with synthetic corundum (Al₂O₃, ruby) or synthetic spinel (MgAl₂O₄); exact identification requires testing

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Clear Quartz

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Amethyst cabochon

Quartz, silicon dioxide (SiO₂), purple variety colored mainly by iron impurities and irradiation

Quartz crystal cluster (likely iron-stained quartz)

Quartz, silicon dioxide (SiO₂), with possible iron-oxide inclusions

Tektite

Impactite (Natural Silicate Glass)

Blue aventurine quartz (likely)

Quartz, silicon dioxide (SiO₂), probably blue aventurine variety

Muscovite Mica (Granitic Pegmatite)

Muscovite - KAl2(AlSi3O10)(OH)2

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Pyrite

Iron Pyrite (FeS2)

Milky quartz-rich rock

Quartz, silicon dioxide (SiO₂), possibly quartzite or a quartz-bearing pegmatite fragment

Tumbled quartz-rich pebble, possibly smoky quartz or chert

Quartz (SiO₂), or microcrystalline quartz if chert

Quartz vein rock with iron-oxide staining

Milky quartz (SiO₂), locally stained by hematite/goethite; possible feldspar or host-rock fragments

Quartz

Silicon Dioxide (SiO2)

Tumbled quartz-rich stone, possibly milky quartz or quartzite

Quartz (SiO₂), potentially quartzite if metamorphic

Pink Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Chalcedony

Cryptocrystalline Quartz (SiO2)

Rose Quartz

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

Milky Quartz

Silicon Dioxide (SiO2)

Cullet Glass (Strawberry Glass)

Amorphous Silicon Dioxide (SiO2) with metallic dopants

Milky quartz (with iron-oxide staining)

Quartz, silicon dioxide (SiO₂)

Rose Quartz

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

Quartz with Sulfide Inclusions

Silicon Dioxide (SiO2) with metallic mineral inclusions

Chalcedony (Common Opal or Agate variant)

Silicon Dioxide (SiO₂)

Quartz (Milky/Smoky variety)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Amethyst

Quartz (SiO2)

Tumbled milky quartz, possibly quartzite

Quartz (SiO₂); the specimen may be a quartz-rich metamorphic rock if its texture is granular

Fulgurite

Fulgurite (Lechatelierite/Silica glass)

Clear quartz (likely rough quartz crystal)

Quartz, silicon dioxide (SiO₂)

Quartz (Milky/Smoky mix)

Silicon Dioxide (SiO2)

Sandstone

Sandstone (clastic sedimentary rock)

Red Sandstone (with possible iron oxide staining)

Sandstone (primarily Quartz with Hematite/Goethite cement)

Quartz Vein Rock with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar