Mineral Based Composite

Granite

Phaneritic felsic intrusive igneous rock

Gold Nugget

Gold (Au)

Gold

Gold (Au)

Gold

Gold (Au)

Gold

Native Gold (Au)

Gold Nugget

Gold (Au)

Gold

Gold (Au)

Rose Quartz

Quartz (Silicon Dioxide, SiO2)

Amethyst

Silicon Dioxide with iron impurities (SiO2)

Sandstone

Arenite (primarily SiO2)

Concretion

Septarian Concretion (Fragmentary)

Tumbled rose quartz

Quartz, SiO₂ (pink variety commonly called rose quartz)

Unidentified Dark Mineral or Rock

Indeterminate (Likely Silicon Dioxide or Carbon-based)

Aquamarine

Beryl (Be3Al2Si6O18 with iron impurities)

Quartz pebble

Silicon Dioxide (SiO2)

Smoky Quartz Cluster

Smoky Quartz (Silicon Dioxide - SiO2)

Epidote

Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)

Sandstone (with banding/weathering)

Clastic Sedimentary Rock (primarily SiO2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Gneiss

Gneiss (High-grade metamorphic rock)

River Stone (Quartzite/Siltstone mixture)

Silicon Dioxide (SiO2) based metamorphosed sandstone

Milky quartz with iron staining

Quartz (SiO₂), likely massive vein quartz

Tumbled milky quartz

Quartz, silicon dioxide (SiO₂)

Polished honey/pink calcite heart

Calcite, calcium carbonate (CaCO₃)

Weathered iron-rich stone, possibly limonite-bearing rock

Limonite/goethite mixture (hydrated iron oxides), identification uncertain from image

Turquoise ring stone (likely stabilized or dyed turquoise)

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

Gold Nugget

Native Gold (Au)

Sandstone

Arenite (SiO2 primarily)

Milky quartz pebble

Quartz (SiO₂), massive variety

Milky quartz

Quartz, silicon dioxide (SiO₂)

Likely calcite fragment

Calcite (CaCO₃), possibly limestone or marble

Blue calcite (probable)

Calcite — CaCO₃

Small brown-gray mineral fragment

Indeterminate; possibly weathered quartz-, feldspar-, or iron-oxide-bearing rock

Conglomerate

Clastic Sedimentary Rock (Conglomerate)

Yellow Quartz

SiO2 (Crystalline Silicon Dioxide)

Moss Agate

Chalcedony (Silicon Dioxide) with dendritic inclusions (SiO2)

Cinnabar in Quartz

Silicon Dioxide (SiO2) with Mercury Sulfide (HgS) inclusions

Rough Diamond

Diamond (pure Carbon, C)

Greenstone (likely chlorite- or epidote-rich metamorphic rock)

Greenstone; commonly metamorphosed basalt or dolerite, with chlorite, epidote, and actinolite

Likely weathered stone or mineral fragment

Unidentified fine-grained silicate rock; possible basalt, greenstone, or serpentine

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.