Granite
Granite (phaneritic intrusive felsic igneous rock)
igneous
Category
Igneous Or Metamorphic (Base Stone); Anthropogenic (Decoration)
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Native American Hammerstone / Pitted Stone
Modified lithic artifact (often quartzite, basalt, or granite)
artifact / sedimentary or igneous rock
Iron Slag
Ferrous Slag (Silicate/Oxide mixture)
industrial byproduct (anthropogenic)
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartzite Pebble
Metamorphic Quartzite (primarily SiO2)
metamorphic
Granite
Phaneritic plutonic igneous rock (SiO2 range 65-75%)
igneous
Basalt (Porphyritic)
Porphyritic Basalt
igneous
Basalt Pebble
Basalt
igneous
Basalt with Porphyritic Texture
Porphyritic Basalt
igneous
Amygdaloidal Basalt
Basalt with secondary mineral infilling (commonly SiO2 or Zeolites)
igneous
Basalt
Mafic extrusive igneous rock
igneous
Diorite
Phaneritic Intermediate Igneous Rock
igneous
Basalt with Epidote (Greenstone)
Epidote-bearing Metabasalt
metamorphic
Biotite (Black Mica)
Biotite (K(Mg,Fe)3AlSi3O10(OH)2)
mineral
Granitoid (Granite/Granodiorite)
Plutonic igneous rock (variable composition, primarily SiO2)
igneous
Iron Slag
Ferrous Slag (Industrial Byproduct)
mineraloid (anthropogenic byproduct)
Biotite mica
Biotite, a potassium–iron–magnesium phyllosilicate mica; approximate formula K(Mg,Fe)₃AlSi₃O₁₀(F,OH)₂
mineral
Pyrite
Iron Disulfide (FeS2)
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Likely mica-rich schist
Mica schist, probably muscovite–biotite schist with quartz and feldspar
metamorphic
Basalt
Extrusive Igneous Rock
igneous
Quartzite Pebble
Quartzite (SiO2 based)
metamorphic
River Pebble (Basalt or Graywacke)
Mafic Igneous Rock (Basalt)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Basalt
Basalt (Mafic Extrusive Igneous Rock)
igneous
Granite
Granite (composed primarily of Quartz, Feldspar, and Mica)
igneous
Basalt
Mafic Igneous Rock
igneous
Basalt
Extrusive Igneous Rock
igneous
Tumbled or naturally etched mica-rich mineral specimen, likely muscovite
Muscovite, KAl₂(AlSi₃O₁₀)(OH)₂; possibly phlogopite mica
mineral
Pink Granite
Phaneritic Plutonic Rock (Felsic)
igneous
Agate (Polished Nodule)
Agate (Silicon Dioxide, SiO2)
mineral
Mixed Gemstone Collection
SiO2 (Quartz varieties) and Biogenic CaCO3 (Nacre)
mineral
Dyed tumbled quartz (likely quartzite or quartz crystal)
Quartz, silicon dioxide (SiO₂)
mineral
Diorite (River Pebble)
Intermediate plutonic igneous rock
igneous
Basalt Pebble
Extrusive mafic igneous rock
igneous
Mica schist (likely biotite–muscovite schist)
Mica schist; chiefly quartz and mica minerals (muscovite KAl₂(AlSi₃O₁₀)(OH)₂ and/or biotite)
metamorphic
Granite
Intrusive Phaneritic Felsic Igneous Rock
igneous
Malachite (possibly chrysocolla-bearing)
Malachite, Cu₂CO₃(OH)₂; the blue-green areas may include chrysocolla, Cu₂H₂Si₂O₅(OH)₄
mineral
Hawk's Eye / Pietersite (Tiger's Eye variant)
Pseudomorph of Quartz after Crocidolite (SiO2)
metamorphic
River Pebble (Granite/Sandstone Pebble)
Rounded Quartz/Feldspar Gravel Clast
igneous
Milky quartz
Quartz (silicon dioxide, SiO₂)
mineral
Quartzite
Quartzite (SiO2-rich metamorphic rock)
metamorphic