Mineral In Metamorphic Rock

Schist

Crystalline Metamorphic Rock (Schistose)

River Stone (Granitic Gneiss)

Foliated Granitic Gneiss

Dark metamorphic rock, likely schist or phyllite

Micaceous schist/phyllite; commonly quartz, mica, and feldspar

Mixed polished rock/mineral specimens

Indeterminate from image; likely quartz-bearing material with iron-oxide staining and possibly mica-rich schist

Garnet Schist

Garnet-bearing Mica Schist (variety of compositions, often Al2SiO5 with X3Y2(SiO4)3)

Foliated metamorphic rock, likely gneiss or mica schist

Quartz–feldspar–mica metamorphic rock; exact identification is uncertain from the photograph

Lapis Lazuli

(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)

Quartz Vein / Milky Quartz

Silicon Dioxide (SiO2)

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Gneiss

Gneiss (a type of metamorphic rock)

Greenstone (or Greywacke/Metasediment Pebble)

Metamorphosed Mafic Rock / Chlorite Schist

Quartz with Mica

Silicon Dioxide (SiO2) with Mica group inclusions

Serpentinite

Serpentinite (complex silicate minerals including lizardite, chrysotile, and antigorite: (Mg,Fe)3Si2O5(OH)4)

Epidote

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

Quartz Vein in Sedimentary Matrix

Silicon Dioxide (SiO2) with host rock

Unidentified gray-green rock specimen

Possibly banded gneiss or another foliated metamorphic rock; identification is uncertain from the image

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

K-Feldspar (Potassium Feldspar)

Orthoclase / Microcline (KAlSi3O8)

Quartz vein fragment

Quartz, silicon dioxide (SiO₂), likely milky to translucent quartz with iron-oxide or clay inclusions

Quartz

Silicon Dioxide (SiO2)

River Stone (possibly Gneiss)

Metamorphic Gneiss

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite: KAl2(AlSi3O10)(OH)2

Quartz vein fragment

Quartz (SiO₂), likely milky quartz with iron-oxide staining

Tumbled Black Tourmaline

Schorl (NaFe2+3Al6Si6O18(BO3)3(OH)3OH)

Agate

Silicon Dioxide (SiO2)

Galena

Lead(II) sulfide (PbS)

Granite Gneiss

Granitic Gneiss

Quartzite with Mica / Gneiss Pebble

Metamorphic Rock (Quartz-Feldspar-Mica aggregate)

Quartzite with Iron inclusions

Quartzite (SiO2 with Fe2O3 trace impurities)

River Cobble (Gneiss/Schist mix)

Foliated Metamorphic Rock (Gneissic/Schistose)

Milky quartz vein rock

Quartz (SiO₂), likely in a quartz-rich host rock with minor iron-stained minerals

Greenish Metamorphic Rock (likely containing epidote or chlorite)

Metamorphic rock, possibly epidosite or greenstone

Gneiss

Gneiss (High-grade metamorphic rock)

Likely gray-green metamorphic rock fragment

Unidentified fine-grained metamorphic rock; exact identification is not possible from this small image

Chrysocolla on Matrix

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

Lapis Lazuli (Low Grade)

Lazurite-rich metamorphic rock ((Na,Ca)8(AlSiO4)6(SO4,S,Cl,OH)2)

Small rounded stone or mineral fragment

Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment

Leopard jasper (orbicular jasper)

Silicified volcanic rock, chiefly microcrystalline quartz/chalcedony (SiO₂) with feldspar and iron-oxide inclusions

Greenstone

Protolith: Basaltic rock

Milky Quartz Pebble

Silicon Dioxide (SiO2)