Mineral In Metamorphic Rock

Reddish-brown crystalline rock, possibly weathered granite or garnet-bearing schist

Indeterminate; likely quartz–feldspar–mica rock with iron oxides, potentially garnet-bearing

Likely quartz-rich rock fragments

Uncertain; probable quartz with iron-oxide staining, possibly mica-bearing metamorphic rock

Biotite-bearing metamorphic rock, likely gneiss or schist

Mica-rich quartz–feldspar gneiss/schist; exact identification requires testing

Gneiss (Metamorphic Rock)

Gneiss

Quartz

Silicon Dioxide (SiO2)

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)

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)

White Quartz Pebble

Silicon Dioxide (SiO2)

Gneiss

Gneiss

Vein-bearing metamorphic rock, likely gneiss or schist

Banded silicate rock; likely quartz–feldspar–mica gneiss with a quartz vein

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

Milky quartz with iron-oxide staining

Quartz (SiO₂), likely with goethite/limonite coatings

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

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

Quartz-rich rock with chlorite/epidote vein

Milky quartz with green chlorite or epidote; exact identification requires testing

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

Polished ruby-in-fuchsite (tentative)

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

Weathered quartz-bearing rock, possibly gneiss or quartzite

Indeterminate; likely quartz-rich metamorphic rock containing quartz and feldspar

Brown Marble

Metamorphic Limestone (CaCO3)

Mica Schist

Mica Schist

Slate

Slate (Foliated Metamorphic Rock)