Micaceous Schist
Mica Schist (primarily Muscovite or Biotite KAl2(AlSi3O10)(OH)2)
metamorphic
Category
Mineral Like Byproduct (Technogenic)
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Sandstone
Sandstone (clastic sedimentary rock)
sedimentary
Concretion with Geode Cavity
Ferruginous Sandstone Concretion with Quartz Center
sedimentary
Schist
Schist (Crystalline metamorphic rock)
metamorphic
Mahogany Obsidian
Volcanic Glass with Hematite inclusions (SiO2)
igneous
Bauxite
Bauxite (mixture of Gibbiste Al(OH)3, Boehmite ̳-AlO(OH), and Diaspore ́-AlO(OH))
sedimentary
Mica Schist
Metamorphic rock dominated by micas (muscovite, biotite)
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Muscovite Mica
KAl2(AlSi3O10)(F,OH)2
mineral
Obsidian
Obsidian (Volcanic Glass)
igneous
Quartz Vein in Host Rock (Gossanous Matrtix)
Silicon Dioxide (SiO2) with iron oxides (Limonite/Hematite)
mineral
Epidote
Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Specular Hematite (Specularite)
Iron Oxide (Fe2O3)
mineral
Blue Quartz (Dumortierite Quartz)
SiO2 with inclusion of AlAl6BSi3O18
mineral
Greenstone
Greenschist / Meta-basalt
metamorphic
Red Sandstone (Iron-stained)
Clastic sedimentary rock (primarily Quartz with Iron Oxides)
sedimentary
Amethyst (Tumbled)
Amethyst (Silicon Dioxide, SiO2 + Fe4+)
mineral
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Blue Apatite
Fluorapatite (Ca5(PO4)3F)
mineral
Boji Stone (Pop Rocks or Moqui Marbles)
Iron-manganese oxide concretion (Goethite/Hematite/Jarosite)
sedimentary
Quartz
Silicon Dioxide (SiO2)
mineral
Muscovite (White Mica)
Muscovite - Potassium aluminum silicate: KAl2(AlSi3O10)(F,OH)2
Mineral
Quartz (Milky or Cloudy Quartz)
Silicon Dioxide (SiO2)
mineral
Biotite (Black Mica) in Host Rock
K(Mg,Fe)3AlSi3O10(OH,F)2
mineral
Ferruginous Conglomerate (or Iron-Rich Concrete/Slag)
Clastic Sedimentary (Silicon Dioxide/Iron Oxide matrix)
sedimentary
Greenstone
Greenschist
metamorphic
Limonite (Iron-rich Siltstone / Sandstone base)
Hydrous ferric oxide mixture (FeO(OH)·nH2O)
sedimentary
Sandstone
Arenite
sedimentary
Vein-filled Basalt or Diabase Pebble
Mafic igneous rock with quartz/calcite veins
igneous
Jasper pebble
Silicon Dioxide (SiO2) with iron oxide impurities
sedimentary
Coral Fossil (Petoskey-style or Colonial)
Hexagonaria percarinata (Order: Rugosa)
fossil
Amygdaloidal Basalt with Quartz
Basalt (SiO2 inclusion)
igneous
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese
mineral
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2) with Limonite/Goethite
mineral
Quartz (Yellow/Tan Quartzite Pebble)
Silicon Dioxide (SiO2)
metamorphic
Limonite (Iron Ore)
Limonite; FeO(OH)·nH2O
mineral
Lepidolite
K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2
mineral
Sandstone
Arenite (SiO2 based with various mineral cements)
sedimentary
Crackle Agate / Dyed Quartz
SiO2 (Silicon Dioxide)
mineral
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Limonite (Iron Ore)
Limonite (mixed iron hydroxides, primarily FeO(OH)·nH2O)
mineral