Mineral (Silicate Replaced Organic Material)

River Pebble (Likely Chert or Fine-Grained Sandstone/Quartzite)

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Banded Gneiss

Gneiss (pronounced 'nice')

Quartz

Silicon Dioxide (SiO2)

Black Tourmaline (Schorl)

Schorl (Na(Fe²⁺)₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Calcite

Calcite (CaCO3)

Jade (Nephrite or Jadeite)

Nephrite (Ca2(Mg,Fe)5Si8O22(OH)2 - a variety of actinolite, an amphibole mineral); Jadeite (Na(Al,Fe3+)Si2O6 - a pyroxene mineral)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Citrine

Quartz (SiO2) - variety Citrine

Slate

Slate (a fine-grained, foliated metamorphic rock). Mineral composition: Primarily composed of mica minerals (muscovite, chlorite, sericite) and quartz, with minor amounts of hematite, pyrite, and other accessory minerals.

Quartz (likely a weathered/tumbled piece)

Quartz (SiO₂)

Quartz

Quartz (SiO₂)

Gold (Processed)

Gold (Au)

Turquoise (beads)

Turquoise; CuAl6(PO4)4(OH)8·4H2O

Quartz (variety of colors)

SiO2 (Silicon Dioxide)

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.

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Granite

Granite (a plutonic igneous rock composed of quartz, feldspar, and mica)

Citrine Quartz

Quartz (SiO2) - specifically, a variety of macrocrystalline quartz

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Charoite

(K,Sr,Ba,Ca)15-16(Na,Ca)8(Si,Al)24O60(OH,F)4 · nH2O (Hydrated silicate of potassium, calcium, and sodium)

Marble

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

Note: Item is not a geological specimen

Polyester mesh and Ethylene-vinyl acetate (EVA) polymer

Red Jasper

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

Halite

Halite (NaCl)

Quartz

Quartz (SiO₂ - Silicon Dioxide)

Serpentinite

Serpentinite (composed primarily of Serpentine group minerals, (Mg,Fe,Ni,Al,Zn,Mn)2-3(Si,Al,Fe)2O5(OH)4)

Dark-colored Igneous Rock (likely Basalt or Diabase)

Basalt (extrusive igneous) or Diabase (intrusive igneous)

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Granite

Granite (a plutonic igneous rock)

Tektite (likely Australite)

Tektite (no specific chemical formula as it's a natural glass of variable composition, mostly SiO2, Al2O3, FeO, MgO, CaO, K2O, Na2O, TiO2)

Chert (varieties include Flint or Jasper)

Chert (cryptocrystalline quartz; SiO₂)

Metal Alloy (Jewelry)

Not a naturally occurring rock or mineral; likely a metal alloy for jewelry. Possible compositions include sterling silver (92.5% silver, 7.5% copper), or other silver/gold alloys.

Serpentinite

Serpentinite

Beaded Jewelry (Assorted Gemstones)

Various minerals, including but not limited to Quartz (SiO2), Garnet (X3Y2(SiO4)3), Jade (Na(Al,Fe)Si2O6), Amethyst (SiO2),等の多様な組み合わせ

Rose Quartz Carving

Quartum roseum (Variety of Quartz, SiO2)

Quartz (possibly milky quartz or quartz with inclusions)

SiO2 (Silicon Dioxide)

Quartz with Iron Stains

Quartz (SiO2) with iron oxide/hydroxide staining

Fluorite

Fluorite (CaF₂)

Granite

Granite (Felsic intrusive igneous rock)

Fluorite (likely)

Calcium Fluoride (CaF2)

Basalt

Basalt