Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Category
Sedimentary Or Metamorphic
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Pyrite
Iron Disulfide (FeS2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
sedimentary
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Yellow Calcite
Calcium Carbonate (CaCO3)
mineral
Quartzite
Metamorphic Rock consisting chiefly of Quartz (SiO2)
metamorphic
Brown Marble
Metamorphic Limestone (CaCO3)
metamorphic
Quartzite Pebble
Metamorphic Quartz (SiO2)
metamorphic
Pyrite
Iron Pyrite (FeS₂)
Mineral
Agate
Silicon Dioxide (Chalcedony), SiO2
sedimentary
Dark gray foliated metamorphic rock, likely slate or phyllite
Slate/phyllite; chiefly quartz, mica, and chlorite
metamorphic
Slate
Foliated Metamorphic Rock
metamorphic
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Foliated Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Gneiss
Foliated Metamorphic Gneiss
metamorphic
Gneiss
Gneissic Metamorphic Rock
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Quartz (Smoky/Milky variety)
Silicon Dioxide (SiO2)
mineral
Banded gneiss (likely biotite-bearing)
Gneiss; quartz–feldspar–mica assemblage, with possible iron-oxide staining
metamorphic
Banded gneiss
Gneiss, commonly quartz–feldspar–biotite gneiss
metamorphic
Tumbled gneiss
Gneiss, chiefly quartz–feldspar with mica and dark ferromagnesian minerals
metamorphic
Banded Slate
Slate (Metamorphosed Siltstone/Mudstone)
metamorphic
Blue Kyanite
Kyanite (Al2SiO5)
mineral
Quartzite Pebble
Metamorphic Quartzite (SiO2)
metamorphic
Tumbled Slate or Basalt Pebble
Metamorphic fine-grained rock / Slate or Phyllite
metamorphic
Schist
Metamorphic Rock (Schist)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Banded Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Weathered sandstone or metasedimentary rock
Quartz-rich sandstone; possibly weakly metamorphosed quartzite
sedimentary
Quartz (Clear/Milky)
Silicon Dioxide (SiO2)
mineral
River Pebble (Quartzite)
Quartzite (SiO2)
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Coarse-grained granite
Granite; predominantly quartz, potassium feldspar, plagioclase, and biotite/hornblende
igneous
Dark metamorphic rock, likely schist or phyllite
Quartz–mica schist/phyllite; chiefly quartz, mica, and feldspar
metamorphic
Rhodonite
Rhodonite (Mn,Fe,Mg,Ca)SiO3
mineral
Green Kyanite
Kyanite (Al2SiO5)
mineral
Magnetite with Quartz
Magnetite (Fe3O4)
mineral
Quartzite
Metamorphic Quartzite (SiO2)
metamorphic
Mica Schist
Schist (biotite/muscovite schist)
metamorphic
Quartz Crystal
Silicon Dioxide (SiO2)
mineral