Clear quartz (likely quartz crystal fragment)
Quartz, silicon dioxide (SiO₂)
mineral
Category
Mineral And Metamorphic Rock
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Quartz-rich rock, possibly milky quartz or quartzite fragment
Quartz (SiO₂), potentially quartzite if metamorphic
mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Tumbled milky quartz
Quartz (SiO₂), microcrystalline or massive variety
mineral
Banded Agate
Silicon Dioxide (SiO2)
gemstone
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Milky quartz with iron-oxide staining
Quartz (silicon dioxide, SiO₂)
mineral
Blue Apatite
Apatite, Ca5(PO4)3(F,Cl,OH)
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine group minerals (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4)
metamorphic
Mica Schist
Foliated Metamorphic Rock (Schist)
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Banded River Rock / Gneiss (highly weathered)
Gneiss
Metamorphic rock
Gneiss with Quartz Veining
Gneiss (High-grade regional metamorphic rock)
metamorphic
Milky quartz (rough quartz fragment)
Quartz, silicon dioxide (SiO₂)
mineral
River Pebble (Gneiss or Quartzite mixture)
Metamorphic rock (Commonly Gneissic)
metamorphic
Schist
Mica Schist (Metamorphic rock)
metamorphic
Rock crystal quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Milky quartz (massive quartz)
Quartz, silicon dioxide (SiO₂)
mineral
Quartz-rich metamorphic rock, likely mica schist
Mica schist; chiefly quartz (SiO₂) with biotite/muscovite mica and possible feldspar
metamorphic
Schorl (Black Tourmaline)
NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl)
mineral
Milky quartz with iron-oxide staining
Quartz (SiO₂), likely ferruginous milky quartz
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Amphibolite
Amphibolite
metamorphic
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Milky quartz (rough crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Milky quartz fragment
Quartz (silicon dioxide, SiO₂)
mineral
Greenschist (or Serpentinite) with Quartz-Feldspar Vein
Metabasalt / Greenschist Facies Rock
metamorphic
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Tumbled and polished quartz crystal points
Quartz (silicon dioxide, SiO₂), chiefly rock crystal with smoky or included varieties
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Milky quartz (rough quartz specimen)
Quartz, silicon dioxide (SiO₂)
mineral
Serpentinite
Serpentinite (Mg, Fe, Ni)3Si2O5(OH)4
metamorphic
Pyrite
Iron Sulfide (FeS2)
mineral
Tumbled milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Unakite Epidote-Granite
Unakite (Epidotized Granite)
metamorphic
Garnet Amphibolite (or Garnet Gneiss)
Garnet amphibolite / Garnet-bearing metamorphic rock
metamorphic
Epidote
Epidote ({Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH))
mineral
Hematite
Iron Oxide (Fe2O3)
mineral
Garnet Schist
Almandine Garnet Schist (Fe3Al2(SiO4)3 in Schistose matrix)
metamorphic
Dyed Agate / Quartz
Silicon Dioxide (SiO2) with artificial dye
mineral
Serpentinite
Serpentinite (composed primarily of Serpentine minerals: Mg3Si2O5(OH)4)
metamorphic