Mineral

Tumbled quartz or calcite specimen

Quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Greenstone / Metabasalt

Chlorite schist or Epidiorite

Greenstone

Protolith: Basaltic rock

Greenstone

Greenschist / Meta-basalt

Weathered granite cobble

Granite, a coarse-grained felsic intrusive igneous rock

Limonite Boxwork / Iron Ore Concretion

FeO(OH)qnH2O (Hydrated iron oxide)

Botryoidal Goethite

Goethite (α-Fe3+O(OH))

Vein-bearing metamorphic rock, likely gneiss or schist

Banded silicate rock; likely quartz–feldspar–mica gneiss with a quartz vein

Tumbled banded gneiss

Gneiss, a foliated metamorphic rock; exact mineral composition cannot be determined from the image

Schist

Schist; commonly mica schist, composed chiefly of muscovite/biotite mica with quartz and feldspar

Likely lepidolite-bearing mica or purple fluorite

Lepidolite: K(Li,Al)3(Si,Al)4O10(F,OH)2; alternatively fluorite: CaF2

Vesuvianite (Idocrase)

Ca19(Al, Mg, Fe)13(SiO4)10(Si2O7)4(OH, F, O)10

Bornite

Bornite (Cu5FeS4)

Epidote with quartz/feldspar

Epidote, Ca2(Al,Fe)3(SiO4)3(OH)

Ironstone concretion (possibly pyrite-bearing)

Iron-rich sedimentary concretion, likely composed of goethite/limonite with possible pyrite

Weathered basalt pebble

Basalt, a fine-grained mafic volcanic rock; likely olivine- and pyroxene-bearing

Mixed Mineral Collection (Quartz, Amethyst, Rose Quartz, Pyrite, etc.)

Mixed Silicates and Sulfides (SiO2, FeS2)

Small unidentified mineral specimen

Indeterminate from image; possibly a quartz-family crystal or sulfide mineral

Weathered, foliated metamorphic rock (likely schist)

Mica schist, composition uncertain from the photograph

Likely gneiss pebble

Gneiss, a foliated metamorphic rock composed mainly of quartz, feldspar, and mica

Granite pebble

Granite, chiefly quartz, feldspar, and mica

Tumbled or weathered gneiss

Feldspar–quartz–mica gneiss (composition variable)

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Extrusive volcanic rock)

Likely chrysocolla-bearing copper ore

Chrysocolla, a hydrated copper silicate; exact identification is uncertain from the small, blurry image

Brecciated serpentinite

Serpentinite breccia, composed mainly of serpentine-group minerals (e.g., lizardite, antigorite, chrysotile) with pale carbonate or quartz-rich veins

Vesicular basalt (likely weathered lava rock)

Vesicular basalt; primarily plagioclase feldspar, pyroxene, and volcanic glass, with possible iron-oxide alteration

Copper Ore (with Malachite/Chrysocolla and Iron Oxides)

Secondary Copper Minerals (Cu2(CO3)(OH)2 / (Cu,Al)2H2Si2O5(OH)4·nH2O)

Lepidolite

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

Vanadinite

Pb5(VO4)3Cl

Turquoise

CuAl6(PO4)4(OH)8"""""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" """""""""" • 4H2O (Hydrated copper and aluminum phosphate)

Turquoise

Hydrated phosphate of copper and aluminum, CuAl6(PO4)4(OH)8·4H2O

Limonite

FeO(OH)•nH2O

Hematite (Botryoidal / Kidney Ore)

Iron Oxide (Fe2O3)

Limonite with Ironstone

Limonite (hydrated iron(III) oxide-hydroxides), FeO(OH)·nH2O

Fluorite

Calcium fluoride (CaF2)

Turquoise (with Hematite)

CuAl6(PO4)4(OH)8·4H2O

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide)

Limonite (Ironstone)

Hydrous ferric oxides (FeO(OH)·nH2O)

Limonite / Ironstone

Hydrated Iron Oxide (FeO(OH)·nH2O)

Quartz with Pyrite

Silicon Dioxide (SiO2) with Iron Sulfide (FeS2)

Small dark mineral fragment

Undetermined; image lacks diagnostic detail for reliable identification

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)