Mineral Composite

Aquamarine

Beryl (Be3Al2Si6O18 with trace Fe2+)

Epidote

Epidote (formula: Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Granite

Granite (Felsic Plutonic Rock)

Sandstone

Clastic Sedimentary Rock

Sandstone

Sedimentary Rock (Quartz arenite/Arkose)

Sandstone

Arenite

Dalmatian Stone

Dalmatian Stone (a peralkaline igneous rock consisting of Feldspar, Quartz, and Arfvedsonite)

Uncertain small pale mineral fragment

Indeterminate; possibly calcite or a light-colored feldspar fragment

Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine

Tentatively chrysocolla (hydrated copper phyllosilicate, approximately (Cu,Al)2H2Si2O5(OH)4·nH2O); exact identification requires testing

Blue quartz-like mineral specimen

Likely quartz (SiO₂), possibly dyed or coated; exact identification requires testing

Small polished pink-and-white mineral pebble

Likely rose quartz or pale pink quartz; exact identification is uncertain from the image

Raw smoky quartz with dark mineral inclusions

Quartz (SiO₂), likely smoky quartz; dark inclusions may be chlorite, tourmaline, or iron/manganese oxides

Dyed mineral cluster, likely calcite or aragonite

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

Blue mineral specimen, likely bornite (“peacock ore”)

Bornite, Cu5FeS4, possibly iridescent chalcopyrite (CuFeS2)

Small brown-gray mineral fragment

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

Pale green rough mineral specimen, likely serpentine or calcite

Probable serpentine-group mineral, Mg₃Si₂O₅(OH)₄; possibly pale-green calcite, CaCO₃

Polished black mineral or volcanic glass fragment

Indeterminate; possibly obsidian or black tourmaline

Small dark mineral/rock fragment

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

Pale green tumbled mineral fragment, likely serpentine or green calcite

Probable serpentine-group mineral (Mg3Si2O5(OH)4) or, less likely, calcite (CaCO3); identification is uncertain from the photograph

Blue-green copper mineral specimen, likely chrysocolla or turquoise

Probable chrysocolla, hydrated copper phyllosilicate (Cu₂H₂Si₂O₅(OH)₄·nH₂O); turquoise, CuAl₆(PO₄)₄(OH)₈·4H₂O, is an alternative

Sandstone

Arenite

Sandstone (Iron-stained)

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Quartz Geode

Silicon Dioxide (SiO2)

Sandstone (Iron-stained)

Arenite (primarily SiO2 with Fe2O3 staining)

White Quartz Pebble

Silicon Dioxide (SiO2)

Sandstone (Banded)

Clastic Sedimentary Rock: Arenite

Quartz (Chatoyant or Milky variety)

Silicon Dioxide (SiO2)

Satin Spar (Gypsum)

Hydrous calcium sulfate (CaSO4·2H2O)

Magnetite

Magnetite (Fe3O4)

Selenite

Gypsum (Calcium Sulfate Dihydrate) - CaSO4·2H2O

Quartz Geode

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Sandstone

Sedimentary Rock (Quartz Sandstone)

Basalt with Xenolith

Extrusive Igneous Rock containing Mantle Xenolith

Gneiss with Quartz Vein

Metamorphic Gneiss

Turquoise

CuAl6(PO4)4(OH)8·4H2O

Fossilized Vertebra

Chordata fossil (Vertebra)

Sphalerite with Siderite and Pyrite

Zinc Sulfide (ZnS) with Iron Carbonate (FeCO3) and Iron Disulfide (FeS2)

Granite with Epidote

Phaneritic intrusive igneous rock with Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Pyrite (Fool's Gold) in Matrix

Iron Disulfide (FeS2)

Red Sandstone

Arenite (Ferruginous Sandstone)