Man Made Material (Anthro Lithic Product)

Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt

Basalt (extrusive igneous rock)

Amazonite

KAlSi3O8 (Potassium Feldspar, variety of Microcline)

Sandstone

Arenite or Sandstone

Carnelian

Chalcedony (cryptocrystalline quartz), SiO2

Marble

Marbles are primarily composed of calcite (calcium carbonate, CaCO3) or dolomite (calcium magnesium carbonate, CaMg(CO3)2).

Pyrite

Pyrite (Iron sulfide, FeS₂)

Quartzite

Quartzite (primarily SiO2)

Chrysoprase

Chrysoprase (a variety of Chalcedony, SiO₂)

Shale with Vein Infillings

Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.

Quartz Geode (likely within Limestone or Dolomite matrix)

Quartz (SiO₂)

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Himalayan Salt

Halite (mineral name), chemical formula NaCl (sodium chloride). Generally, 'Himalayan Salt' is a trade name for evaporite minerals from specific regions.

Chalk

Calcareous Ooze (composed primarily of coccoliths)

Quartz (pebble)

Quartz (SiO₂)

Halite

Halite (NaCl)

Garnet (likely Pyrope or Almandine)

Garnet Group (complex nesosilicate minerals, e.g., Pyrope Mg3Al2(SiO4)3, Almandine Fe3Al2(SiO4)3, Spessartine Mn3Al2(SiO4)3, Grossular Ca3Al2(SiO4)3, Andradite Ca3Fe2(SiO4)3, Uvarovite Ca3Cr2(SiO4)3). The vivid red color in the image strongly suggests Pyrope or Almandine.

Sandstone (Pebble/Conglomerate fragment)

Sandstone (clastic sedimentary rock)

Serpentine

Serpentinite (a rock composed primarily of serpentine minerals like antigorite, chrysotile, and lizardite; general formula (Mg, Fe)3Si2O5(OH)4)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Caliche (also known as hardpan, calcrete, kankar)

Primarily composed of calcium carbonate (CaCO₃), often mixed with other minerals like quartz, clay minerals, and iron oxides.

Quartz (Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Quartz

Silicon Dioxide (SiO₂)

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Quartz (in matrix)

Quartz (SiO₂)

Pebble

Clast (specifically a granule or small pebble)

Serpentinite (Serpentine Rock)

Primarily composed of serpentine group minerals, such as antigorite, chrysotile, and lizardite. Chemical formula for serpentine minerals is (Mg,Fe)3Si2O5(OH)4.

Fossil Coral

Coral Limestone (a type of biogenic sedimentary rock)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Shale or Argillite

Shale (fine-grained clastic sedimentary rock) or Argillite (low-grade metamorphic rock derived from shale)

Quartz (Druzy) in host rock

SiO₂ (Silicon Dioxide) as Quartz, with unspecified host rock components (likely silicates and iron oxides)

Serpentine

Serpentinite (rock), Serpentine group minerals (e.g., Antigorite, Lizardite, Chrysotile)

Talc

Talc (Mg₃Si₄O₁₀(OH)₂)

Granite

Granite (a broadly defined plutonic igneous rock, often more specifically classified as quartz monzonite or granodiorite based on precise mineral percentages)

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Granite

Granite (a common rock type, not a single mineral species)

Quartzite

Quartzite (SiO2)

Leopard Skin Jasper

Chalcedony (cryptocrystalline quartz) with inclusions

Serpentinite (Serpentine Rock)

Serpentinite is a rock composed of one or more serpentine group minerals, chiefly antigorite, chrysotile, and lizardite, with the general formula (Mg,Fe)3Si2O5(OH)4. Often includes other minerals like magnetite, talc, and chromite.

Chert (or Flint)

Chert (microcrystalline or cryptocrystalline quartz, SiO2)

Soapstone

Steatite (primarily composed of Talc, Mg₃Si₄O₁₀(OH)₂)