Metamorphic Or Sedimentary Depending On Local Grade

Mica-rich Sandstone or Micaceous Schist Weathering

Micaceous Schist (Muscovite-Quartz composition)

Rough Garnet (Almandine)

Almandine Garnet (Fe3Al2(SiO4)3)

Gneiss

Gneiss (High-grade metamorphic rock)

Gneiss (specifically Pink Gneiss)

Gneiss (high-grade regional metamorphic rock)

Garnet in Matrix (likely Almandine in Quartz/Mica Schist)

Almandine Garnet (Fe3Al2(SiO4)3) in Quartz-Feldspar host rock

Lapis Lazuli (polished cabochon)

Lazurite-rich metamorphic rock (approx. Na6Ca2Al6Si6O24(SO4,S,Cl)2)

Chert (Jasper variety)

Silicon Dioxide (SiO2)

Greenstone

Chlorite schist or metabasalt depending on specific composition

Chert (Nodule)

Microcrystalline or Cryptocrystalline Quartz (SiO2)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Feldspar-rich Quartzite

Meta-arkose (Quartz-Feldspar Quartzite)

Milky Quartz with Iron Inclusions

Quartz (Silicon Dioxide, SiO2)

Epidote

Epidote (Ca2(Al,Fe)3(SiO4)3(OH))

Almandine Garnet in Matrix

Almandine (Fe3Al2(SiO4)3)

Yellow Quartzite (Onyx Pebble)

Silicon Dioxide (SiO2) - Quartzite

Conglomerate

Conglomerate (clastic sedimentary rock)

Quartz (Milky or Clear Quartz fragment)

Silicon Dioxide (SiO2)

Magnetite (Charnockite Regional Variation)

Magnetite (Fe3O4)

Ferruginous Conglomerate

Conglomerate with Iron-Oxide Matrix (SiO2 + Fe2O3/FeO(OH))

Quartz with Schist Matrix

Crystalline Silicon Dioxide (SiO2) in micaceous schist

Kyanite

Kyanite (Al2SiO5)

Schist

Schist (various mineral compositions)

Ferruginous Sandstone (with Iron Oxide staining)

Clastic Sedimentary Rock - Quartz Arenite/Wacke

Chert Nodule

Chert (SiO2)

Druzy Quartz on Host Rock

Silicon Dioxide (SiO2) with various iron-oxide inclusions

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Greenschist

Greenschist facies rock

Schist

Schist

Glacial Erratic (Sandstone/Quartzite)

Glacial Erratic specimen (likely Orthoquartzite or Feldspathic Sandstone)

Jasper

Chalcedony (SiO2)

Milky Quartz (with Iron staining)

Silicon Dioxide (SiO2)

Phyllite

Phyllite (Intermediate grade metamorphic rock)

Stony-Iron Meteorite (likely Mesosiderite or Ordinary Chondrite)

Meteorite (Silicate-Metal Matrix)

Sandstone (with Arkose characteristics)

Clastic sedimentary rock (SiO2 with KAlSi3O8)

Yellow Quartz (Citrinated Quartz)

Silicon Dioxide (SiO2)

Vesicular Basalt with Epidote/Amygdaloidal Basalt

Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)

Magnetite / Iron Ore

Magnetite (Fe3O4)

Lapis Lazuli (in Matrix)

Na8[Al6Si6O24]S2 (Lazurite as the primary component)

Kyanite in Quartz

Kyanite (Al2SiO5) with Quartz (SiO2) matrix

Quartzite (Iron-stained)

Quartzite (primarily SiO2)

Kyanite

Kyanite (Al2SiO5)

Sandstone

Arenite (primarily SiO2)