Mineral In Metamorphic Rock

Raw garnet-rich metamorphic rock

Likely garnet-bearing schist or garnetite; garnet-group silicates, commonly almandine (Fe₃Al₂Si₃O₁₂)

Gneiss

Foliated Metamorphic Rock

Gneiss

Gneissic Metamorphic Rock

Quartz-veined metamorphic rock, likely quartzite or schist

Quartz-rich metamorphic rock with a milky-quartz vein; exact host rock is indeterminate from the photo

Pyrite-bearing metamorphic rock (likely schist or quartzite)

Mica/quartz-rich metamorphic matrix with pyrite (FeS₂), possibly chalcopyrite (CuFeS₂)

Likely pyrite-bearing metamorphic rock

Quartz–mica schist or phyllite with disseminated pyrite (FeS₂)

Likely garnet-bearing metamorphic rock

Garnet-rich schist or gneiss; garnet is commonly almandine, Fe₃Al₂(SiO₄)₃

Gneiss with Quartz Vein

Metamorphic Gneiss

Schist

Metamorphic Rock (Schist)

Likely blue-green kyanite

Kyanite, Al₂SiO₅

Weathered quartz-rich metamorphic rock

Likely quartzite or quartz-rich gneiss; predominantly SiO₂ (quartz) with possible feldspar and mica

Likely quartz-rich metamorphic rock (quartzite or micaceous schist)

Quartzite/schist; predominantly quartz (SiO₂) with mica and minor iron oxides

Weathered iron-rich metamorphic rock, likely schist or quartzite

Provisional identification: ferruginous quartzite or mica schist; composition likely quartz (SiO₂), iron oxides/hydroxides, and mica or clay minerals

Dark gray metamorphic rock, likely hornfels or fine-grained amphibolite

Hornfels/amphibolite; commonly quartz, feldspar, amphibole, biotite, and minor sulfides

Banded Gneiss

Gneiss (Metamorphic Rock)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Quartz-bearing metamorphic rock, likely schist or quartzite

Quartz (SiO₂) in a mica-rich metamorphic matrix

Gneiss

Gneiss (High-grade regional metamorphic rock)

Gneiss

Metamorphic rock (Gneiss)

Banded Gneiss

Gneiss (Metamorphic Rock)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly quartz (SiO₂), with minor feldspar, mica, and iron-oxide staining

Quartzite

Quartz-rich metamorphic rock; chiefly SiO₂ (quartz)

Milky quartz-bearing metamorphic rock, likely quartzite

Quartzite, composed predominantly of quartz (SiO₂), possibly with mica and feldspar

Gneiss

Gneiss (Metamorphic Rock)

Garnet-bearing metamorphic rock, likely schist or gneiss

Biotite–garnet schist/gneiss; dark minerals likely biotite and graphite or amphibole, with quartz and feldspar

Garnet-bearing metamorphic rock, likely garnet gneiss or garnet amphibolite

Garnet-bearing gneiss; red crystals likely almandine garnet, Fe₃Al₂(SiO₄)₃

Foliated metamorphic rock, likely slate or phyllite

Slate–phyllite; primarily quartz, mica, and clay-derived minerals

Garnet Schist

Garnet-bearing Mica Schist

Agate (Polished Nodule)

Agate (Silicon Dioxide, SiO2)

Pyrite

Iron Sulfide (FeS2)

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly crystalline SiO₂, with minor gray mica/graphite or accessory minerals

Aventurine (Green Quartz)

Silicon dioxide with inclusions (SiO2 + K(Al,Cr)2AlSi3O10(OH)2)

Green aventurine (likely)

Quartz, SiO₂, containing fuchsite mica or other green inclusions

Quartz-rich metamorphic rock, likely quartzite

Quartzite; predominantly microcrystalline quartz (SiO₂), with possible iron-oxide staining and minor mica/feldspar

Quartz-veined dark metamorphic rock

Likely quartz-bearing hornfels, amphibolite, or altered basalt; exact identification requires a fresh surface and tests

Quartz-rich metamorphic rock, likely mica schist or gneiss

Quartz–feldspar–mica metamorphic aggregate; exact identification requires thin-section or field tests

Quartz-veined dark metamorphic rock

Likely quartz-mica schist or foliated basalt with a quartz vein

Weathered, quartz-rich metamorphic rock (likely schist or gneiss)

Quartz–feldspar–mica schist/gneiss, with surface lichens and iron-oxide staining

White Jade (Nephrite)

Nephrite, Ca2(Mg,Fe)5Si8O22(OH)2

Auriferous Quartz (Gold-bearing Quartz)

Silicon Dioxide (SiO2) with trace Gold (Au) and Iron Oxides

Granite-like granitic rock

Crystalline plutonic rock, primarily quartz, feldspar, and mica/amphibole

Coarse-grained granite or granitic pegmatite fragment

Granite; primarily quartz, feldspar, and mica