Mineral Based Human Made Alloy

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Biotite Schist

Biotite Gneiss/Schist (approximate formula K(Mg,Fe)3AlSi3O10(OH)2)

Quartz with Mica

Silicon Dioxide (SiO2) with Phyllosilicates (Mica)

Ironstone (Limonite/Hematite)

Ferruginous Sedimentary Rock (composed largely of Fe2O3 and FeO(OH)·nH2O)

Sandstone (Limonitic/Arkose)

Sandstone (primarily SiO2 with FeO(OH)·nH2O)

Sandstone (Ferruginous)

Arenite (with Iron Oxide)

Ironstone (with possible Hematite/Limonite coating)

Ironstone (Fe-rich sedimentary rock)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Hematite/Limonite impurities

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Quartz (Agate/Chalcedony)

Silicon Dioxide (SiO2)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Ferruginous Sandstone (Gozzan-like)

Ferruginous Sandstone (SiO2 with FeO(OH) inclusions)

Citrine

Silicon Dioxide (SiO₂)

Diorite

Diorite (Intermediate Plutonic Rock)

Druzy Quartz (Botryoidal)

Silicon Dioxide (SiO2)

Limestone (Ocherous)

Calcium Carbonate (CaCO3) with Iron Oxide (Limonite)

Vuggy Quartz on Matrix

Silicon Dioxide (SiO2)

Sandstone with Iron Oxide Staining

Clastic sedimentary rock (primarily SiO2 with Fe2O3 staining)

Basalt (or similar Mafic Igneous Rock)

Basalt

Basalt

Mafic volcanic rock (primarily Plagioclase and Pyroxene)

Basalt

Basalt (Aphanitic Mafic Igneous Rock)

Greywacke (River Slikenside)

Greywacke (Lithic Sandstone)

Chalcedony Geode / Quartz Druzy

Silicon Dioxide (SiO2)

Citrine Quartz (Heat-Treated Amethyst)

Silicon Dioxide (SiO2)

Diorite

Intermediate Phaneritic Igneous Rock

Sandstone Pebble

Arenite

Diorite (or Gabbro/Gneiss stream pebble)

Diorite

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Greenstone

Metabasalt / Chlorite Schist

Muscovite Mica

Muscovite (KAl₂(AlSi₃O₁₀)(F,OH)₂))

Dendritic Chert

Silicon Dioxide with Manganese Oxide Inclusions (SiO2 + MnO2)

Granite

Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)

Granite

Plutonic felsic rock (Quartz, Feldspar, Mica)

Garnetiferous Quartzite (Garnet Gneiss Pebble)

Garnet-bearing Quartzite or Quartz-Feldspar Gneiss

Granite

Course-grained intrusive igneous rock

Diorite

Phaneritic intermediate plutonic rock

Granitic Gneiss

Gneiss (High-grade Metamorphic Rock)

Granite

Granite

Olivine-bearing Basalt / Scoria

Mafic Igneous Rock (primarily (Mg, Fe)2SiO4)

Vesicular basalt (likely amygdaloidal basalt)

Basalt, a mafic volcanic rock composed mainly of plagioclase feldspar, clinopyroxene, and commonly olivine; vesicles are partly mineral-filled amygdules.

Fossilized Shark Tooth

Fossilized Elasmobranchii tooth (likely Odontaspis or Carcharias)