Sedimentary (Processed Mineral Product)

Possible sodalite-bearing rock

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂, likely in a feldspathic matrix

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Tumbled carnelian (likely)

Cryptocrystalline chalcedony, SiO₂; orange-red variety commonly called carnelian

Quartz Pebble

Silicon Dioxide (SiO2)

Weathered iron-rich rock, likely limonite-bearing sandstone or laterite

Limonite/goethite-rich ferruginous rock; composition commonly FeO(OH)·nH₂O with quartz and clay minerals

Magnetite Sand (Black Sand)

Magnetite (Fe3O4)

Flint or chert, possibly a knapped stone tool

Microcrystalline quartz (SiO₂), commonly chalcedony with possible carbonaceous impurities

Gold (10K Alloy)

Aurum (Au) with alloying metals (Cu, Ag, Zn)

Slag Glass (Cullet)

Amorphous Silica (man-made), primarily SiO2 with trace metal oxides

Red Jasper

Jasper (Silicon Dioxide with iron oxide inclusions), SiO2

Metallic sulfide mineral specimen, likely pyrite-bearing ore

Likely pyrite (FeS₂), possibly mixed with other sulfides or host rock

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

Siliciclastic clast (likely Chert or Quartzarenite/Quartzite pebble)

Dyed Blue Agate

Chalcedony (Silicon Dioxide / SiO2)

Quartzite

Quartzite (SiO2)

Clear quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Tumbled blue glassy mineral, possibly sodalite or blue aventurine

Identification uncertain; likely sodalite (Na₈Al₆Si₆O₂₄Cl₂) or blue-dyed quartz/slag-like material

Muscovite Schist

KAl2(AlSi3O10)(OH)2 (Muscovite) in Schist Matrix

Sea Glass

Man-made silicate glass weathering product

Granite

Phaneritic Plutonic Felsic Rock

Rose quartz (likely)

Quartz, silicon dioxide (SiO₂), cryptocrystalline to crystalline variety

Green Slag Glass

Amorphous Silicon Dioxide (with metallic impurities)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Pink tourmaline (rubellite)

Elbaite tourmaline, lithium sodium aluminum borosilicate: Na(Li1.5Al1.5)Al6(BO3)3Si6O18(OH)4

Green glass-like cabochon, likely synthetic glass or resin

Unidentified green transparent material; possibly molded glass, synthetic spinel, or resin

Granite

Phaneritic Felsic Igneous Rock

Lepidolite

Lepidolite (K(Li,Al)3(Si,Al)4O10(F,OH)2)

Quartzite (Engineered Stone)

Silicon Dioxide (SiO2) based synthetic composite

Bauxite (Aluminum Ore)

Hydrated aluminum oxides, primarily Al(OH)3, AlO(OH)

Granite

Granite (Felsic Plutonic Rock)

Limonite/Goethite Gossan

FeO(OH)·nH2O (Hydrated iron oxide)

Polished black stone, likely shungite

Shungite; carbon-rich mineraloid composed mainly of amorphous carbon, with silica and other minerals

Weathered iron-rich geode or cavity fragment

Limonite/goethite-rich material, likely coating a weathered basaltic or volcanic host rock

Tumbled serpentine-rich rock

Serpentinite, likely antigorite/lizardite with magnetite and minor carbonates

Schorl (Black Tourmaline)

Sodium Iron Aluminum Borosilicate Hydroxide - NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH

Small seashell fossil or shell fragment

Likely calcium-carbonate shell material, chiefly aragonite or calcite; exact species indeterminate

Tumbled pale chalcedony (likely quartz)

Microcrystalline quartz, SiO₂; possibly pale agate or quartz

Dyed mineral cluster, likely calcite or aragonite

Calcite (CaCO₃) or aragonite (CaCO₃), artificially color-enhanced

Chalcopyrite in Gossan

Chalcopyrite (CuFeS2) in a Limonite-rich Gossan matrix

Red Coral (Dyed or Reconstituted)

Corallium rubrum (if natural) or Calcite/Aragonite with dye

Clay (as a rock-forming material)

Clay minerals (e.g., Kaolinite group, Smectite group, Illite group, Chlorite group)

Clear quartz crystal

Quartz (silicon dioxide, SiO₂)

Aura Quartz

Titanium-coated Silicon Dioxide (SiO2)