Mineral And Metamorphic Rock

Quartzite with Iron Inclusions

Metamorphosed Quartz-rich Rock (SiO2 with Fe2O3)

Red Quartzite (River Pebble)

Quartzite (primarily Silicon Dioxide - SiO2)

Dendritic Agate

Chalcedony (SiO2) with manganese/iron oxide inclusions

Wishing Stone with Quartz Veins

Quartzite or Quartz-veined Metamorphic Rock (composed mainly of SiO2)

Greenstone / Graywacke

Metagraywacke (Chlorite-grade schistose rock)

Polished green stone, likely serpentine or altered basalt

Serpentine-group minerals, chiefly Mg₃Si₂O₅(OH)₄; exact identification requires testing

Quartz / Quartzite

Silicon Dioxide (SiO2)

Gneiss (Banded Gneiss)

Gneiss

Lapis Lazuli

Lapis Lazuli (Rock containing Lazurite, Calcite, and Pyrite)

Red Quartzite

Tectonically compressed Quartz-rich rock (SiO2)

Serpentine

(Mg,Fe)3Si2O5(OH)4

Milky Quartz with Matrix

Silicon Dioxide (SiO2)

Smoky Quartz (Vein Quartz)

Quartz (Silicon Dioxide, SiO2)

Green Quartzite

Quartzite (primarily SiO2 with chromium-rich mica/fuchsite impurities)

Blue Apatite

Apatite-(CaF), Ca5(PO4)3F (Calcium Fluorophosphate)

Blue Quartzite (Dyed)

Metamorphosed Quartz-rich Sandstone (SiO2 with organic dye)

Pyrite

Iron Disulfide (FeS2)

Lapis Lazuli (Lazurite crystals on Marble)

Lazurite / (Na,Ca)8[(S,Cl,SO4,OH)2|(AlSiO4)6]

Quartzite

Metamorphic Quartzite (SiO2)

Greenstone / Serpentinite

Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)3(Si, Al, Fe)2O5(OH)4

Polished serpentine pebble

Serpentinite, chiefly serpentine-group minerals (chrysotile, lizardite, antigorite)

Greenschist

Chlorite schist (Metamorphic rock dominated by chlorite, epidote, and actinolite)

Banded Agate

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Emerald in Matrix

Beryl (Be3Al2(SiO3)6) embedded in schist or pegmatite host rock

Quartz (Milky/Clear Quartz)

Silicon Dioxide (SiO2)

Greenstone

Metamorphic Rock (Greenschist facies)

Schist

Schist (primarily mica-schist)

Banded Gneiss (Variety of Gneiss)

Gneiss (specifically, a variety exhibiting prominent banding; mineral composition can vary, but often contains quartz, feldspar, mica, and amphibole)

Mixed rock and mineral collection

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

Mica Schist

Mica Schist (primarily Muscovite and Quartz)

Greenstone Pebble

Metabasalt (often containing chlorite, actinolite, or epidote)

Sedimentary Pebble

Sedimentary Rock Fragment

Unakite

Unakite (Epidotized Granite)

Mica Schist

Schist (primarily muscovite and quartz)

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Beryl (likely Aquamarine) in matrix

Be3Al2(SiO3)6 (Beryllium Aluminum Silicate)

Serpentinite

Serpentinite (composed primarily of serpentine group minerals including antigorite, chrysotile, and lizardite)

Gneiss pebble

Banded gneiss, commonly quartz–feldspar–biotite gneiss

Gneiss

Gneiss

Copper-bearing Mica Schist

Mica Schist with Native Copper inclusions

Rough Garnet in Matrix

Almandine Garnet (Fe3Al2Si3O12)

Greenish rock with white veins, possibly epidote or chlorite bearing rock with quartz/calcite veins

Altered mafic rock or Epidosite