Metamorphic Mineral

Galena

Lead Sulfide (PbS)

Likely biotite-rich schist

Mica schist, composed chiefly of biotite and quartz; exact identification is uncertain from the image.

Likely gneiss pebble

Foliated quartz–feldspar gneiss, with dark biotite or amphibole

Gneiss

Foliated quartz–feldspar gneiss, likely biotite-bearing

Green Aventurine

Quartz with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Rhodonite

Rhodonite (Manganese silicate, (Mn,Fe,Mg,Ca)SiO3)

Rhodonite

Rhodonite (Manganese Iron Magnesium Calcium Silicate) - (Mn,Fe,Mg,Ca)SiO3

Tumbled green stone, likely serpentine or nephrite jade

Serpentine-group minerals (commonly antigorite/lizardite), possibly nephrite jade (intergrown tremolite–actinolite)

Schist

Mica Schist (Metamorphic Rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Tumbled rhodonite

Rhodonite, manganese inosilicate (MnSiO₃)

Green Aventurine

Tectosilicate, variety of Quartz (SiO2) containing Fuchsite (K(Al,Cr)2(AlSi3O10)(OH)2)

Sandstone or Quartzite

Arenite (if sedimentary) / Quartzite (if metamorphic)

Quartz pebble

Silicon dioxide (SiO2)

Mica Schist

Schist (Mica-rich Metamorphic Rock)

Apatite

Fluorapatite (Ca5(PO4)3F)

Epidote

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH))

Likely gneiss pebble

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

Uncertain gray metamorphic rock, likely gneiss or schist

Quartz–feldspar–mica rock; exact identification requires close examination

Kyanite

Kyanite, Al₂SiO₅

Orange Calcite (likely polished specimen)

Calcite

Galena with Pyrite

Lead Sulfide (PbS) associated with Iron Sulfide (FeS2)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Rhodonite

Rhodonite (Mn2+SiO3 or (Mn,Fe,Mg,Ca)SiO3)

Milky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron Oxide (Fe2O3)

K-Feldspar (Potassium Feldspar / Pink Feldspar)

KAlSi3O8 (Potassium Aluminum Silicate)

Epidote

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

Osumilite in Granite Matrix

(K,Na)(Fe,Mg)2(Al,Fe)3(Si,Al)12O30

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with mineral inclusions

Sapphire

Corundum (Al2O3)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions of Fuchsite mica

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Quartz in Matrix (Lepidolite or Quartzite)

Silicon Dioxide (SiO2) with host rock

Muscovite

KAl2(AlSi3O10)(OH)2

River Pebble (Gneiss/Schist mix)

Metamorphic rock aggregate

Likely garnet crystal

Garnet-group silicate; species cannot be determined from the image

Apatite

Calcium phosphate fluoride/chloride, Ca5(PO4)3(F,Cl,OH)

Schist

Metamorphic Schist

White Sapphire

Corundum (Al2O3)

Carved Stone Turtle

Carved Soapstone and Quartz

Pyrite

Iron Disulfide (FeS2)