Mineral (Native Element Alloy)

Lapis Lazuli

Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)

Limonite

Limonite (FeOO·nH2O)

Lepidolite

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

Pink Sapphire

Corundum (Al2O3 with trace Chromium and Iron)

Chrysocolla on Matrix

Hydrated copper phyllosilicate (Cu,Al)2H2Si2O5(OH)4·nH2O

Chalcopyrite (Peacock Ore)

Copper Iron Sulfide (CuFeS2)

Aquamarine

Beryl (Be3Al2Si6O18 with trace Fe2+)

Epidote

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

Petrified Wood

Silicified Wood (SiO2)

Rounded pink granite pebble

Granite, chiefly quartz, alkali feldspar, plagioclase, and minor biotite/hornblende

Greenschist (or Serpentinite) with Quartz-Feldspar Vein

Metabasalt / Greenschist Facies Rock

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 (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

Limonite (Iron Ore)

Limonite (FeO(OH)·nH2O)

Fluorite

Calcium Fluoride (CaF2)

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)

Red Sandstone

Arenite (SiO2 with Fe2O3)

Septarian Nodule

Septarian Concretion (Calcium Carbonate/Aragonite/Calcite)