Sedimentary Or Metamorphic (Base Substrate)

River Pebble (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) mixture with varied clastic minerals

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Mica Schist with Pyrite

Muscovite/Biotite Schist with Iron Sulfide (FeS2)

Muscovite Schist

Muscovite Mica Schist (KAl2(AlSi3O10)(OH)2)

Mica-rich schist

Mica schist, composed chiefly of muscovite and/or biotite mica with quartz and possibly feldspar

Biotite Schist

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

Mica Schist with Iron Staining

Mica Schist

Weathered mica-rich schist (likely muscovite schist)

Muscovite–quartz schist; chiefly muscovite mica and quartz, with possible feldspar and iron-bearing minerals

Likely biotite-bearing metamorphic rock (schist or gneiss)

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Likely muscovite-bearing mica schist

Mica schist, composed mainly of quartz and mica (muscovite and/or biotite)

Mica Schist (with Garnet)

Garnet-Mica Schist

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Citrine Quartz

Silicon Dioxide (SiO2) with iron impurities

Gneiss (Metamorphic Rock)

Gneiss

Weathered sandstone or iron-stained quartzite

Quartz-rich sandstone; possibly weakly metamorphosed quartzite (SiO₂ with iron-oxide coatings)

Metallic sulfide-rich rock, possibly pyrite-bearing schist or marcasite specimen

Likely pyrite (FeS₂) in a foliated host rock; exact identification requires testing

Mica Schist (with Muscovite)

Muscovite Mica Schist (KAl2(AlSi3O10)(F,OH)2)

Water and Silt (Sedimentary Environment)

Suspended Sediment / H2O (dihydrogen monoxide)

Micaceous Schist

Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)

Quartzite

Quartzite (SiO2 based)

Quartzite Pebble

Quartzite (SiO2 based)

Mica-bearing metamorphic rock, likely schist

Muscovite/biotite mica schist with quartz and feldspar

Desert rose

Gypsum (selenite) rosette, CaSO₄·2H₂O

Gneiss (with Quartz and Biotite Mica)

Gneiss

Mica Schist

Mica Schist (primarily Muscovite and/or Biotite composition)

Amethyst and mixed gemstone bracelet

Amethyst: purple quartz, silicon dioxide (SiO₂); likely accompanied by other quartz or decorative mineral beads

Muscovite mica schist

Muscovite-rich schist; chiefly muscovite mica with possible quartz and feldspar

Aura Agate

Silicon Dioxide with metal coating (SiO2)

Marble

Metamorphosed Limestone (main mineral: Calcite, CaCO3)

Biotite Mica

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

Red Aventurine

Quartz with inclusions (SiO2)

Rough Emerald (Beryl)

Emerald (Be3Al2(SiO3)6 with Cr/V impurities)

Red Painted Rock

Artificial Coated Lithic Fragment

Green Opal

Hydrated Silica (SiO2·nH2O)

Mica-rich metamorphic rock, likely phyllite or mica schist

Muscovite- and/or biotite-bearing schist/phyllite; exact identification requires testing

Mica Schist with Quartz and Muscovite

Muscovite-Quartz Schist

Mixed mineral and rock collection, including likely amethyst and assorted tumbled stones

Unidentified mixed specimens; visible purple quartz is likely amethyst (SiO₂)

Biotite-rich schist

Mica schist; primarily quartz, feldspar, and biotite mica

Gneiss

Foliated metamorphic rock, likely granitic gneiss; commonly composed of quartz, feldspar, and mica or amphibole

Schist with Quartz

Mica Schist (contains Muscovite/Biotite and Quartz SiO2)

Amethyst and Hematite Bracelet

Amethyst (SiO2) and Hematite (Fe2O3)

Labradorite

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