Magnetite (in matrix)
Magnetite (Fe3O4)
mineral
Category
Industrial Byproduct
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Limestone
Calcium Carbonate (CaCO3)
sedimentary
Pumice
Pumice (volcanic glass formed of highly vesicular rough textured rock)
igneous
Yellow Quartzite (River Pebble)
Silicon Dioxide (Metamorphosed Sandstone), SiO2
metamorphic
Peridot
Olivine (Magnesium Iron Silicate), (Mg, Fe)2SiO4
mineral
Jasper (Red Jasper)
Silicon Dioxide (SiO₂)
sedimentary
Chert (Tripolitic Chert / Flint Nodules)
Microcrystalline Quartz (SiO2)
sedimentary
Pumice
Pumice (a vesicular volcanic glass)
igneous
Sandstone (Quartzose Sandstone)
Clastic sedimentary rock (primarily SiO2)
sedimentary
Mica Schist
Mica Schist
metamorphic
Quartzite (Beach Pebble)
Quartzite (primarily SiO2)
metamorphic
Jasper (Milky/Cream Variety)
Silicon Dioxide (SiO2) - variety of Chalcedony
sedimentary (chemical/biological)
Diamond
Carbon (C)
mineral
Quartz Geode in Sedimentary Matrix
Silicon Dioxide (SiO2) within a limestone/dolostone host
mineral
Quartz Cobble (with Iron Staining)
Silicon Dioxide (SiO2)
mineral
Schist with Biotite Inclusion
Biotite-bearing Mica Schist (K(Mg,Fe)3AlSi3O10(F,OH)2)
metamorphic
Golden Quartz (Citrine or Iron-stained Quartz)
Silicon Dioxide (SiO2)
mineral
Ruby (Raw Corundum)
Corundum (Al2O3:Cr)
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Dyed Chalcedony (Agate)
Silicon Dioxide (SiO2) with artificial pigment
mineral
Glass
Amorphous Silicon Dioxide (SiO2)
mineraloid
Eroded Brick or Pumice-like Scoria
Vesicular Basalt / Scoria (Anthropogenic variant: Eroded Firebrick)
igneous
Dyed Pink Agate (or Dyed Quartzite)
Silicon dioxide (SiO2) with artificial pigment
sedimentary
Raw Diamond (Rough Uncut)
Diamond (C - pure carbon)
mineral
Rough Diamond
Diamond (C)
mineral
Quartzite
Metamorphosed Quartz Sandstone
metamorphic
Gold Flakes in Oil (Novelty Specimen)
Native Gold (Au)
mineral
Opalite
Synthetic Glass (Hydrated Crystalline Silicon Dioxide simulation)
mineral
Quartzite
Quartzite (SiO2)
metamorphic
Chalk (Limestone)
Calcium Carbonate (CaCO3)
sedimentary
Quartzite
Quartzite (chiefly SiO2)
metamorphic
Quartzite
Quartzite (SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Bauxite (Concretionary)
Bauxite (Al(OH)3, AlO(OH))
sedimentary
Lignite (Brown Coal)
Lignite (C189H155O6N3S)
sedimentary
Pumice
Pumice (a highly vesicular extrusive volcanic rock)
igneous
Chalk
Calcium Carbonate (CaCO3)
sedimentary
Scoria
Scoriaceous Basalt
igneous
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt
Basalt (Mafic volcanic rock)
igneous
Bauxite
Bauxite (Al2O3·nH2O)
sedimentary
Granitoid (Granitic Rock)
Granitoid (Quartzo-feldspathic plutonic rock)
igneous