Muscovite Schist with Quartz
Mica Schist (KAl2(AlSi3O10)(OH)2)
metamorphic
Category
Sedimentary Or Metamorphic (Base Substrate)
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Muscovite Schist with Quartz
KAl2(AlSi3O10)(OH)2 in Schistose matrix
metamorphic
Sandstone, Quartzite, and River Pebbles
Silicon Dioxide (SiO2) based Sedimentary/Metamorphic structures
Sedimentary and Metamorphic
Greenschist
Chlorite schist
metamorphic
Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
metamorphic
Iolite-bearing Gneiss (Cordierite)
Cordierite (Mg2Al4Si5O18) in Gneiss matrix
metamorphic
Mica Schist
Mica Schist (Silicate rock)
metamorphic
Granitic Gneiss
Gneiss (Metamorphic rock predominantly containing quartz, K-feldspar, and plagioclase)
metamorphic
Hard Sandstone (Quartzite)
Quartz-rich Sedimentary Rock (Proto-Quartzite)
metamorphic
Unidentifiable Rock Fragment
Uncertain
Gneiss
High-grade Metamorphic Gneiss
metamorphic
Graphite
Graphite (Carbon, C)
mineral
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Graphite
Graphite (Native Carbon), Formula: C
Metamorphic
Weathered brown river pebble, likely sandstone or iron-rich quartzite
Indeterminate; probable quartz-rich sandstone (quartz and iron-oxide cement)
sedimentary
Yellow Agate
Agate (Varietal form of Chalcedony/Quartz, SiO2)
mineral
Gneiss (or Granite Gneiss)
Metamorphic rock rich in quartz, feldspar, and biotite/amphibole
metamorphic
Quartz Pebble
Silicon Dioxide (SiO2)
mineral
Pumice
Felsic/intermediate vesicular extrusive rock
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Gneiss with Quartz Veining
Gneiss (High-grade Regional Metamorphic Rock)
metamorphic
Epidote
Epidote (Ca2(Al,Fe)3(SiO4)3(OH))
mineral
Beach Pebbles and Quartz Aggregates
Quartz pebbles and biogenic fragments (SiO2, CaCO3)
sedimentary
Greenschist
Chlorite schist
metamorphic
Gneiss
Gneiss
metamorphic
Amphibolite / Biotite Schist
Amphibolite (rich in Hornblende and Plagioclase feldspar)
metamorphic
Epidote-bearing Rock / Epidote Inclusion
Epidote (Ca2(Al, Fe)3(SiO4)3(OH)) in host rock
mineral
Muscovite Mica (with Schist)
Muscovite - KAl2(AlSi3O10)(OH)2
metamorphic
Red Jasper (Quartzite)
Silicon Dioxide (SiO2) with iron oxide inclusions
mineral
Weathered dark stone, possibly basalt
Basalt; commonly plagioclase feldspar, pyroxene, and minor olivine
igneous
Kaolinite (Kaolin)
Kaolinite (Al2Si2O5(OH)4)
mineral
Biotite Schist
Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)
metamorphic
K2 Stone
Azurite in Granite
igneous
Polished Black Basalt Pebble
Basalt
igneous
Rounded gray river pebble, likely basalt or andesite
Fine-grained mafic to intermediate volcanic rock; exact identification requires testing
igneous
Mica Schist with Garnet
Garnetiferous Mica Schist
metamorphic
Fuchsite in Quartz
K(Al,Cr)2(AlSi3O10)(OH)2 (Muscovite with Chromium)
metamorphic
Pyrite-bearing rock, possibly pyrite-rich schist or quartzite
Pyrite (iron disulfide, FeS₂) in a fine-grained metamorphic or quartz-rich matrix
mineral
Banded Quartzite
Quartzite (primarily SiO2)
metamorphic
Biotite Schist
Biotite Mica Schist (K(Mg,Fe)3AlSi3O10(OH,F)2)
metamorphic
Graphite
Graphite (Carbon, C)
mineral
Gneiss (with Quartz-Feldspar vein)
Gneiss (high-grade metamorphic rock) containing Quartz (SiO2) and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8)
metamorphic