Mineral And Metamorphic Rock

Black Sand (Magnetite Sand)

Magnetite-rich Placers (Fe3O4)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Fuchsite (Green Muscovite)

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

Quartzite

Metamorphic rock consisting largely of Quartz (SiO2)

Tiger's Eye

Pseudomorph of Crocidolite (SiO2 with iron oxides)

Gemstone Sand (Mineral Assortment)

Mixed Mineral Concentrates (Commonly including Quartz SiO2, Garnet X3Y2(SiO4)3, and Tourmaline (Na,Ca)(Li,Mg,Al)3(Al,Fe,Mn)6(BO3)3(Si6O18)(OH,F)4)

Milky Quartz (Vein Quartz)

Silicon Dioxide (SiO2)

Dark green metamorphic rock, likely serpentinite

Serpentinite, composed mainly of serpentine-group minerals (antigorite, lizardite, or chrysotile), commonly with magnetite and minor chlorite/talc

Stiped Slate Beach Pebble

Low-grade Metamorphic Slate with Quartz Vein (SiO2 on Phyllosilicate base)

Faceted Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartzite (specifically Milky Quartz variety)

Quartz (SiO2)

Weathered quartz-rich rock fragment

Likely quartz-bearing feldspathic rock; exact identification requires testing

Orange Aventurine / Quartz

Silicon Dioxide (SiO2) with Hematite or Goethite inclusions

Quartz (Milky Quartz / Quartzite)

Silicon Dioxide (SiO2)

Mica Schist

Mica Schist (predominantly Muscovite/Biotite)

Greenstone

Metamorphic mafic rock (greenschist facies)

Banded gneiss

Gneiss, typically quartz–feldspar–mica assemblage

Quartz River Rock

Silicon Dioxide (SiO2)

Biotite Mica

K(Mg,Fe2+)3(Al,Fe3+)Si3O10(OH,F)2

Schist

Mica Schist

Mica Schist

Mica Schist (principally Biotite/Muscovite, Quartz, and Feldspar)

Mica Schist

Mica Schist (Complex Silicate Rock)

Unidentified Rock Fragment

Unknown

Schist

Mica Schist

Gneiss

Gneiss (High-grade Metamorphic Rock)

Banded Chert / Banded Jasper (likely a variety of Chert/Chalcedony)

Chert (microcrystalline quartz)

River Cobble (Quartzite or Gneiss)

Metamorphic crystalline rock (predominantly SiO2 based)

Metallic sulfide ore, likely pyrite-bearing rock

Pyrite (FeS₂), possibly with chalcopyrite and quartz/host rock

Banded gneiss

Felsic biotite–quartz–feldspar gneiss

Quartz Pebble

Silicon Dioxide (SiO2)

Likely galena-bearing metamorphic sulfide ore

Galena (PbS), possibly with pyrite and/or sphalerite in a schistose host

Weathered granitic rock fragment

Granite, predominantly quartz–feldspar–mica assemblage

Milky Quartz (Common Quartz)

Quartz (Silicon Dioxide, SiO2)

Epidote

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

Gneiss

Gneiss (High-Grade Metamorphic Rock)

Gneis

Gneiss (High-grade metamorphic rock)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Milky Quartz with Mica and Pyrite

Quartz (SiO2) with Muscovite (KAl2(AlSi3O10)(OH)2) and Pyrite (FeS2)

Granite Gneiss with Garnet

Garnetiferous Gneiss

Gneiss with Quartz Veining

Gneiss (High-grade Regional Metamorphic Rock)

Blue Sapphire

Corundum (Al2O3 with iron and titanium trace elements)

Pink Feldspar

Orthoclase Feldspar (KAlSi3O8)