Banded Iron Formation (BIF)
Banded Iron Formation (predominantly Hematite Fe2O3 and Magnetite Fe3O4 with Chert SiO2)
sedimentary
Category
Mineral (Refined Metal)
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Schist
Mica Schist
metamorphic
Banded Iron Formation (BIF)
Banded Iron Formation (Fe2O3 + SiO2)
sedimentary
Schist
Mica Schist
metamorphic
Mica Schist
Mica Schist (Quartz-Biotite-Muscovite Schist)
metamorphic
Basalt
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Basalt
Basalt (Mafic volcanic rock)
igneous
Schist (Micaceous)
Mica Schist
metamorphic
Fossil / Permineralized Bone
Tyrannosaurus rex fossil (Hydroxylapatite replaced by various minerals)
sedimentary
Mica Schist
Mica Schist (Predominantly Muscovite/Biotite)
metamorphic
Lapis Lazuli
Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Mica Schist
Mica Schist (primarily Muscovite or Biotite Schist)
metamorphic
Basalt Pebble
Basalt (Aphanitic Mafic Igneous Rock)
igneous
Schist (Micaceous Schist)
Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)
metamorphic
Schist
Mica Schist (primarily consisting of muscovite, biotite, and quartz)
metamorphic
Lapis Lazuli
Lapis Lazuli (Metamorphic Rock containing Lazurite, Calcite, Pyrite, and Sodalite)
metamorphic
Mica Schist
Mica Schist (Quartz-Biotit-Muscovite Schist)
metamorphic
Lapis Lazuli
Lapis Lazuli (Complex aggregate mainly of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Ironstone with Pyrite
Ferruginous Sandstone (Fe2O3) with minor Sulfide minerals (FeS2)
sedimentary
Sunstone Beads
Feldspar group (Oligoclase / Labradorite)
gemstone
Orange Aventurine (Sunstone-style Quartzite)
Silicon Dioxide (SiO2) with Goethite or Hematite inclusions
metamorphic
Vesicular Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 (Pyroxene) and (Ca,Na)Al(Al,Si)Si2O8 (Plagioclase Feldspar)
igneous
Polished blue-green glassy slag or coated mineral fragment
Most likely man-made colored glass/slag; exact composition cannot be determined visually
mineral
Galena-rich sulfide specimen
Galena (lead sulfide, PbS), possibly with sphalerite and oxidized sulfides
mineral
Polished jasper (likely brecciated or iron-rich jasper)
Microcrystalline quartz (SiO₂), colored by iron oxides/hydroxides and possibly sulfide minerals
mineral
Rough Sodalite
Sodalite, Na8(Al6Si6O24)Cl2
mineral
Mica Schist
Foliated Metamorphic Rock (rich in Muscovite or Biotite)
metamorphic
Sandstone with Ironstone Concretion
Arenite with Hematite/Goethite nodules (Fe2O3 / FeO(OH))
sedimentary
K2 stone (azurite–granite)
Biotite granite hosting blue azurite (Cu₃(CO₃)₂(OH)₂), often with malachite and quartz
igneous
Diorite (River Pebble)
Intermediate Phaneritic Igneous Rock
igneous
Basalt
Basalt
igneous
Gold-Bearing River Sand
Auriferous Placer Sand (Au + various minerals like SiO2 and Fe3O4)
sedimentary
Basalt with Scoria/Vesicular Texture
Extrusive Mafic Igneous Rock (primarily Plagioclase Feldspar and Pyroxene)
igneous
Basalt
Extrusive mafic igneous rock; primarily (Ca,Na)(Mg,Fe,Al,Si)2O6 with (Ca,Na)(Al,Si)4O8
igneous
Vesicular basalt (likely weathered lava rock)
Basalt, predominantly calcium-rich plagioclase, pyroxene, and commonly olivine; vesicular texture from gas bubbles
igneous
Mica Schist
Mica Schist (predominantly Muscovite/Biotite Schist)
metamorphic
Muscovite Schist
Muscovite (KAl2(AlSi3O10)(OH)2) in Schist
metamorphic
Oolitic Ironstone
Sedimentary Ooidal Ironstone (Limonite/Hematite mixture)
sedimentary
Basalt with Desert Varnish
Mafic Volcanic Rock (Fe/Mg rich Silicate)
igneous
Schist
Mica Schist
metamorphic
Schist
Mica Schist
metamorphic
Milky Quartz
Silicon Dioxide (SiO2)
mineral