Fuchsite (Chrome Mica)
Cr-bearing Muscovite - K(Al,Cr)2(AlSi3O10)(OH)2
mineral
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Granite
Granite (Felsic Plutonic Rock)
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Slickenside in Limestone
Tectonized Limestone / Calcite (CaCO3)
metamorphic (localized) or sedimentary
Milky Quartz Vein with Iron Staining
Silicon Dioxide (SiO2)
mineral
Basalt
Basalt (composition of plagioclase, pyroxene, and olivine)
igneous
Sandstone (Ferruginous)
Arenite (with iron oxide cement)
sedimentary
Amethyst
Silicon Dioxide with iron impurities (SiO2)
mineral
Quartz with Hematite Staining
Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) inclusions
mineral
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar KAlSi3O8, and Plagioclase)
igneous
Basalt with Quartz/Feldspar Inclusion
Basalt (containing Silicate minerals such as SiO2 and (Ca,Na)(Al,Si)4O8)
igneous
Granite / Quartz Vein Rock
Granitoid with Quartz (SiO2)
igneous
Granite
Granite (Felsic Plutonic Rock)
Igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Granite
Granite (Felsic Plutonic Rock)
igneous
Sandstone with Iron Staining
Arenite (SiO2 with Fe-oxide impurities)
sedimentary
Halite
Halite (Sodium Chloride, NaCl)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Blue Dyed Agate
Silicon Dioxide (SiO2) with artificial pigment
mineral
Milky Quartz with Hematite inclusions
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3)
mineral
Chert (Pink and Yellow Chert)
Microcrystalline Quartz (SiO2)
sedimentary
Sandstone (Ferruginous)
Sandstone (mainly SiO2 with Fe2O3 staining)
sedimentary
Granite
Granite (composed primarily of Quartz SiO2 and Feldspar (KAlSi3O8 – NaAlSi3O8 – CaAl2Si2O8))
igneous
Gneiss
Gneiss (High-grade metamorphic rock)
metamorphic
Mica Schist
Mica Schist (predominantly Muscovite or Biotite sheet silicates)
metamorphic
Limonite after Marcasite (Propeller Conchoid)
Goethite/Limonite pseudomorph after Marcasite (FeO(OH)·nH2O)
mineral
Copper Ore with Chrysocolla and Azurite
Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) / Cu3(CO3)2(OH)2 (Azurite)
mineral
Diorite
Phaneritic intermediate plutonic rock
igneous
Granite
Phaneritic Felsic Igneous Rock
igneous
Granite
Phaneritic Plutonic Rock (Granite)
igneous
Red Jasper
Jasper (Silicon Dioxide, SiO2 with Iron Oxide impurities)
sedimentary
Amygdaloidal Basalt with Quartz Infill
Basalt (SiO2 for the quartz inclusion)
igneous
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz with Garnet/Hematite and Basalt
Silicon Dioxide (SiO2) with Almandine (Fe3Al2Si3O12) and Basalt
mineral
Quartz Crystal
Silicon Dioxide (SiO2)
mineral
Chrysocolla in Jasper (Chryso-Jasper)
Cu2-xAlx(H2-xSi2O5)(OH)4·n H2O (Chrysocolla) + SiO2 (Jasper)
mineral
Azurite and Malachite on Matrix
Azurite: Cu3(CO3)2(OH)2; Malachite: Cu2CO3(OH)2
mineral
Sandstone (likely Arkosic)
Clastic Sedimentary Rock (Sandstone)
sedimentary
Tree Agate
Dendritic Chalcedony (SiO2)
sedimentary
Sandstone
Arenite (primarily SiO2)
sedimentary