Mineral And Metamorphic Rock

Mica Schist

Metamorphic rock dominated by mica minerals

Milky quartz with dark mineral veins

Quartz, silicon dioxide (SiO₂), likely massive vein quartz; dark veins may be chlorite, mica, iron/manganese oxides, or a sulfide mineral

Eclogite

Eclogite

Granitic Gneiss

Gneiss (Metamorphic rock of granitic composition)

Milky quartz crystal

Quartz, silicon dioxide (SiO₂), likely a small prismatic crystal or crystal fragment

Milky quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂)

Schist

N/A (a rock type, not a mineral formula)

Quartz (Iron-Stained)

Silicon Dioxide (SiO2)

Tumbled greenish quartzite or serpentine

Quartzite (mostly SiO₂) or serpentine-group rock

Slate

Foliated Metamorphic Rock (Slate)

Gold-bearing sulfide ore (tentative)

Native gold, likely with pyrite/chalcopyrite in quartz or altered rock

Greenstone / serpentinite-like metamorphic rock

Probable serpentinite-rich greenschist; commonly dominated by serpentine-group minerals, chlorite, actinolite, and magnetite

Quartz

Silicon Dioxide (SiO2)

Mixed mineral and rock specimen collection

Assorted silicates, carbonates, oxides, and sulfides; individual species cannot be reliably identified from this image

White Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Banded gneiss pebble

Gneiss, typically quartz–feldspar–mica assemblage

Foliated amphibolite (likely augen or spotted amphibolite)

Amphibolite, composed chiefly of hornblende and plagioclase; exact identification requires close examination

Dark metamorphic rock, likely schist or gneiss

Mica schist/gneiss; commonly quartz + feldspar + biotite, with possible amphibole

Unknown brown-and-gold rock fragment

Undetermined; possibly iron-stained quartz, mica schist, or sulfide-bearing ore

Quartz-rich metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; commonly containing biotite or muscovite

Gneiss (with Quartzite and Biotite)

Gneiss containing SiO2 (Quartz), K(Mg,Fe)3AlSi3O10(OH)2 (Biotite), and (K,Na,Ca)AlSi3O8 (Feldspar)

Slate

Foliated Metamorphic Rock

Banded Gneiss

Gneiss (Metamorphic Rock)

Slate

Foliated Metamorphic Rock

Slate

Foliated metamorphic rock

Unidentified small rock fragment

Likely quartz-rich material; exact identification is indeterminate from the image

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Wishing Stone (Basalt/Metabasalt with Quartz-Feldspar Vein)

Veined Metabasalt / Veined Greywacke

Green Aventurine

Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions

Quartz-rich mineral fragment

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Biotite-rich gneiss

Gneiss, likely quartz–feldspar–biotite gneiss

Likely polished basalt or iron-rich metamorphic rock

Basaltic rock, chiefly plagioclase and pyroxene; exact identification requires testing

Banded metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica schist/gneiss; exact identification requires a fresh surface and mineral tests

Quartz-rich pegmatite (likely feldspar–quartz rock)

Granitic pegmatite; predominantly quartz (SiO₂) and feldspar, with possible mica and iron-oxide staining

Polished ruby-in-fuchsite (tentative)

Fuchsite mica with corundum (ruby), commonly in quartzite or mica schist

Brown Marble

Metamorphic Limestone (CaCO3)

Mica Schist

Mica Schist

Slate

Slate (Foliated Metamorphic Rock)

Mica Schist

Metamorphic rock dominated by muscovite and/or biotite mica

Quartz Crystal

Silicon Dioxide (SiO2)

Tumbled milky quartz

Quartz (silicon dioxide, SiO₂)