Metamorphic Mineral

Blue calcite, possibly with lazurite/sodalite

Calcite (CaCO₃); blue coloration may reflect inclusions or admixture of sodalite/lazurite

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2

Hematite

Iron(III) oxide (Fe2O3)

Green Aventurine in Host Rock

SiO2 (Quartz with Fuchsite inclusions)

Banded gneiss, probably granitic gneiss

Foliated gneiss composed mainly of quartz (SiO₂), feldspar—orthoclase/microcline and plagioclase—and dark mica, commonly biotite K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂

Staurolite

Staurolite (Fe2Al9O6(SiO4)4(O,OH)2)

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Weathered iron-rich rock, possibly limonite-bearing quartzite or ironstone

Goethite–hematite/limonite with quartz; exact identification requires testing

Kyanite blade

Kyanite, Al₂SiO₅

Pearl and Garnet Glass

Calcium Carbonate (CaCO3) for pearl; Silicon Dioxide (SiO2) for glass

Fluorite (left), Sodalite (middle), Dumortierite/Tumbled Quartzite (right)

Calcium Fluoride (CaF2), Sodium Aluminum Silicate Chloride (Na8(Al6Si6O24)Cl2), Aluminum Borosilicate (Al7(BO3)(SiO4)3O3)

Likely garnet-bearing rock

Garnet-rich schist or garnetiferous metamorphic rock; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Pyrite

Iron Sulfide (FeS2)

Quartz (Engineered Stone Countertop)

Silicon Dioxide (SiO2) within a resin matrix

Black Spinel

Magnesium Aluminum Oxide (MgAl2O4)

Kyanite

Kyanite (Al2SiO5)

Man-made Green Quartz (Lab-grown or Treated)

Silicon Dioxide (SiO2) with artificial coloration

Jade (likely Nephrite Jade based on appearance)

Nephrite (a variety of actinolite, Ca2(Mg,Fe)5Si8O22(OH)2)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Nephrite Jade

Nephrite (a variety of the mineral actinolite within the amphibole group); Chemical Formula: Ca2(Mg,Fe)5Si8O22(OH)2

Epidote

Epidote Group (e.g., Clinozoisite, Epidote, Piemontite), Epidote formula: Ca2(Al,Fe)3(SiO4)3(OH)

Fuchsite

Fuchsite (a variety of Muscovite mica, K(Al,Cr)2(AlSi3O10)(OH)2)

Kyanite (Blue or Blue-Grey)

Kyanite (Al2SiO5)

Tiger's Eye (variations include Blue or Hawk's Eye)

Silicon Dioxide with Crocidolite inclusions (SiO2)

Mixed Tumbled Stones (Mostly Agate, Jasper, and Quartz)

Silicon Dioxide (SiO2)

Mixed rock and mineral specimen collection

Mostly undetermined from the photograph; apparent quartz-rich rocks, sandstone, granite/gneiss, and possibly iron-oxide-bearing specimens

Mixed river-worn rock and mineral collection

Mostly quartz/quartzite, feldspar-bearing granitoid, chert, and mafic volcanic rocks; exact species vary by pebble

Mixed rock and mineral collection

Mixed lithologies; likely quartz, feldspar, basalt, granite, chert, sandstone, and metamorphic rocks

Quartz / Quartzite Fragment

Silicon Dioxide (SiO2)

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Jade

Jadeite or Nephrite

Unidentified brown rock fragment

Indeterminate from image; likely a weathered iron-rich lithic fragment

Nephrite Jade

Nephrite

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Epidote

Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))

Blue Apatite

Calcium Fluorophosphate - Ca5(PO4)3F

Magnetite (Lodestone)

Magnetite (Fe3O4)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Epidote

Epidote - Ca2(Al2,Fe3+)3(SiO4)3(OH)

Rhodonite

(Mn,Fe,Mg,Ca)SiO3

Gneiss with Quartz Vein

Metamorphic Gneiss