Igneous And Metamorphic

Chalcopyrite

Chalcopyrite (CuFeS2)

Quartz (milky quartz variety)

Quartz (SiO₂)

Amethyst

Quartz variety; chemical formula: SiO₂ (silicon dioxide) with Fe³⁺ impurities

Citrine

Quartz (SiO2) - variety Citrine

Limonite (Iron Ore/Hydrated Iron Oxide)

Limonite (mixture of FeO(OH)·nH₂O minerals, mainly Goethite, FeO(OH) and Lepidocrocite, FeO(OH))

Mixed Gemstone Beaded Jewelry

Various minerals (e.g., Quartz varieties like Rose Quartz, Amethyst; Peridot; Garnet; etc.)

Hypersthene

Hypersthene ((Mg,Fe)SiO₃)

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Strawberry Quartz

Silicon Dioxide (SiO2) with inclusions of Goethite or Hematite

Quartz (beads)

SiO2 (Silicon Dioxide)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with various inclusions

Calcite

Calcite (CaCO₃, Calcium Carbonate)

Citrine

SiO2 (Silicon Dioxide)

Bi-Color Tourmaline (or Watermelon Tourmaline)

Tourmaline (complex borosilicate mineral group with general formula AD3G6(BO3)3T6O18(OH,O)4)

Biotite Mica

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

Smoky Quartz

SiO2 (Silicon Dioxide)

Citrine

Quartz (SiO₂) variety

Orthoclase Feldspar

KAlSi3O8 (Potassium Aluminum Silicate)

Aventurine (likely Green Aventurine)

Aventurine (a variety of quartz, SiO₂, with common inclusions of fuchsite)

Rose Quartz

Rose Quartz (SiO2)

Strawberry Quartz

Quartz (SiO₂) with Goethite (α-FeO(OH)) and/or Lepidocrocite (γ-FeO(OH)) inclusions

Orange Calcite

Calcite (CaCO3)

Smoky Quartz

Smoky Quartz (SiO2)

Magnetic Hematite

Magnetized Hematite (an iron oxide mineral, Fe2O3, that has undergone magnetization)

Mixed collection of common river stones

Varied lithologies, visibly including quartz-rich rock, dark mafic rock, sandstone, and purple quartz-bearing material

Pegmatite (likely Granitic Pegmatite)

Pegmatite (a coarse-grained igneous rock, often with granitic composition)

Mixed river stones and gravel

Polymictic alluvial clasts; individual pieces may include quartzite, granite, basalt, sandstone, limestone, and slate

Calcite

Calcite (CaCO3)

Quartz

SiO₂ (Silicon Dioxide)

Sunstone and Green Aventurine

Sunstone: (Ca,Na)[(Al,Si)2Si2O8] (Plagioclase Feldspar Group); Green Aventurine: SiO2 (Quartz)

Beryl (Variety Mix)

Be3Al2(Si6O18)

Moss Agate

Moss Agate (a variety of Chalcedony, SiO ₂)

Veined Pebble (likely a Quartz-Veined Pebble)

Pebble with Mineral Vein (e.g., Quartz Vein in a Chert/Mudstone Pebble)

Mixed stream gravel and common rock specimens

Predominantly quartz-rich granitoid, quartzite, sandstone, shale/slate, and mafic volcanic fragments; exact species cannot be determined confidently from the image

Assorted Beach Rocks and Pebbles

Various (Granite, Basalt, Quartz, Conglomerate, etc.)

Sapphire

Corundum (Al₂O₃) with trace elements causing color variations.

Green Aventurine

Quartz (SiO2) with Fuchsite inclusions

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)

SiO2 with TiO2 inclusions (Quartz with Rutile)