Metamorphic And Mineral

Tumbled Moonstone

Feldspar (Orthoclase/Albite), KAlSi3O8

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Magnetic Sand Grain / Magnetite Pellet

Magnetite (Fe3O4)

Schist

Metamorphic Rock (Schist)

Schist with Quartz Veins

Schist with Quartz (SiO2)

Chalcopyrite (Peacock Ore)

Chalcopyrite (CuFeS2)

Quartz Pebble

Silicon Dioxide (SiO2)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate) - KAl2(AlSi3O10)(F,OH)2

Gneiss

Gneiss (Foliated Metamorphic Rock)

Blue Apatite

Calcium Fluorophosphate (Ca5(PO4)3F)

Quartzite Pebble

Metamorphic Quartzite

Quartzite Pebble

Metamorphic Quartzite

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Quartz with Schist Matrix

Crystalline Silicon Dioxide (SiO2) in micaceous schist

Eclogite

Eclogite (Omphacite + Pyrope)

Granitic Pegmatite

Granitic Pegmatite (principally Quartz, Potassium Feldspar, and Mica)

Gneiss with Quartz Vein

Metamorphic Gneiss with Quartz (SiO2) and Feldspar Injection

Greenstone (likely metamorphosed basalt)

Metabasalt/greenstone; commonly composed of chlorite, actinolite, epidote, albite, and quartz

Unidentified gray-green rock specimen

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

Peacock Ore (Bornite or Iridescent Chalcopyrite)

Bornite (Cu5FeS4) or Acid-treated Chalcopyrite (CuFeS2)

Tiger's Eye

Silicon Dioxide (SiO2) with fibrous inclusions

Magnetite

Fe3O4 (Iron(II,III) oxide)

Greenstone / epidote–chlorite schist (tentative)

Epidote–chlorite schist, likely containing actinolite and quartz/feldspar

Epidote

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

Emerald

Beryl (Be3Al2Si6O18 with Chromium/Vanadium impurities)

Gneiss

Foliated Metamorphic Rock

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Blue Aventurine

Quartz (SiO2) with inclusions

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Quartz-Veined Slate or Greenstone

Metamorphic rock with quartz vein (SiO2)

Quartz with Mica/Host Rock

Silicon Dioxide (SiO2) with Phyllosilicates

Milky Quartz

Silicon Dioxide (SiO2)

Gneiss

Metamorphic Gneiss (High-grade regional metamorphism)

Gneiss

Gneissic Metamorphic Rock

Pink Quartz

Silicon Dioxide (SiO2)

Gneiss (Metamorphosed Granitic Rock)

Gneiss (composed mainly of quartz, feldspar, biotite, and/or hornblende)

Fuchsite Gneiss or Schist

Muscovite (variety Fuchsite) within Metamorphic Host Rock

Clear Quartz (Faceted)

Silicon dioxide (SiO2)

Epidote and Quartz in Basalt

Epidote [Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH)] in Metabasalt

Tumbled green aventurine

Quartz (SiO₂) with fuchsite or other green mica inclusions

Tumbled green aventurine (probable)

Quartzite composed chiefly of quartz (SiO₂), with green fuchsite or other mica inclusions

Magnetite-rich ironstone (probable magnetite ore)

Magnetite, Fe₃O₄, likely in a fine-grained ironstone matrix