Mineraloid (Human Made Geological Specimen)

Quartzite

Metamorphic Quartz Sandstone

Fossilized Shark Tooth (Fragment)

Elasmobranchii gen. et sp. indet. (Calcium Phosphate / Apatite fossil)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz (Iron-stained)

Silicon Dioxide (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Chert (Flint)

Microcrystalline Quartz (SiO2)

Small dark mineral/rock fragment

Indeterminate; possibly magnetite-bearing basalt or iron-rich slag

Fossiliferous Limestone

CaCO3 (principally Calcite or Aragonite)

Basalt

Basalt

Quartz Pebble

Silicon Dioxide (SiO2)

Basalt (Drill Core)

Mafic Volcanic Rock (Basalt)

Tumbled yellow quartz

Quartz (SiO₂), likely iron-stained milky quartz or pale citrine

Amber

Succinite

Satin Spar (often marketed as Selenite)

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Honey calcite (orange calcite)

Calcite, calcium carbonate (CaCO₃)

Amber

Succinite (a Fossilized Tree Resin); Chemical formula is approximately C10H16O

Marble

Metamorphic Limestone (CaCO3)

Quartz (Specifically Clear to Smoky Quartz point)

Silicon Dioxide (SiO2)

Coquina Limestone

Coquina (Biogenic Limestone)

Fossilized bivalve shell fragment

Fossil Mollusca, likely a bivalve (class Bivalvia); exact genus cannot be determined from the image

Quartz (milky quartz), possibly calcite

Quartz: SiO₂; visual identification is uncertain because the specimen is wet and lacks diagnostic crystal faces

Tumbled pale quartz (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Milky Quartz

Silicon Dioxide (SiO2)

Clear Quartz

Silicon Dioxide (SiO2) / Rock Crystal

Pyrite (on Quartz/Sulfide matrix)

Iron Sulfide (FeS2)

Quartzite

Quartzite (SiO2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline quartz (SiO₂), possibly with mica and feldspar

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Chert Pebble (Jasper or Agate variety)

Microcrystalline Quartz (SiO2)

Polished malachite tower

Malachite, Cu₂CO₃(OH)₂ (basic copper carbonate)

Quartzite

Quartzite (SiO2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Quartz with Iron Staining

Silicon Dioxide (SiO2) with Hematite inclusions

Quartz-rich rock with chlorite/epidote vein

Milky quartz with green chlorite or epidote; exact identification requires testing

Quartz (Crystal Cluster)

Silicon Dioxide (SiO2)

Turquoise cabochon

Turquoise — hydrated copper aluminum phosphate, CuAl₆(PO₄)₄(OH)₈·4H₂O

Slag

Ferrous slag (by-product of iron smelting)

Greenish translucent mineral fragment

Indeterminate; possibly serpentine, epidote, or green glassy feldspar

Fluorite Tower

Fluorite (Calcium Fluoride - CaF2)

Quartz Pebble

Silicon Dioxide (SiO2)