Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities
mineral
Category
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Chert (Cherty Limestone / Flint)
Microcrystalline or Cryptocrystalline Quartz (SiO2)
sedimentary
Quartz with Schist Matrix
Crystalline Silicon Dioxide (SiO2) in micaceous schist
metamorphic
Chert (Limestone/Flint variant)
Microcrystalline or cryptocrystalline Quartz (SiO2)
sedimentary
Lunar Highlands Breccia (Meteorite)
Lunar Feldspathic Breccia
igneous
Nephrite Jade
Nephrite (Ca2(Mg, Fe)5Si8O22(OH)2)
metamorphic
Chert (Yellow Jasper)
Microcrystalline Quartz (SiO2)
sedimentary
Fluorite
Calcium Fluoride (CaF2)
Mineral
Hematite
Iron(III) oxide (Fe2O3)
mineral
Amber
Succinite (with formula approximately C10H16O)
Organic mineraloid
Celestine (or Celestite) on Matrix
Celestine (SrSO4)
mineral
Chert (Chalcedony/Agate variety)
Silicon Dioxide (SiO2)
sedimentary
Carnelian (a variety of Chalcedony)
Silicon dioxide (SiO2) with iron oxide impurities
mineral
Carnelian (Red Chalcedony)
Silicon Dioxide (SiO2) with iron oxide impurities
mineral
Shale
Lutaceous Sedimentary Rock
sedimentary
Agate (Puddingstone style)
Silicon Dioxide (SiO2) with impurities
mineral
Sandstone
Arenite (primarily SiO2)
sedimentary
Yellow Jasper
Silicon Dioxide (SiO2) with iron impurities
sedimentary
Gneiss
Gneiss (Metamorphic Rock)
metamorphic
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Chert (Jasper/Flint variety)
Microcrystalline Quartz (SiO2)
sedimentary
Serpentine
Antigorite / Lizardite / Chrysotile mix; (Mg, Fe)3Si2O5(OH)4
metamorphic
Artificial Rock Face (Faux Rock)
Glass Fiber Reinforced Concrete (GFRC)
man-made/construction material
Limestone
Calcium Carbonate (CaCO3)
sedimentary
Lake Superior Agate
Chalcedony (SiO2 with iron impurities)
mineral
Mica Schist with Quartz
Mica Schist (primarily Muscovite or Biotite sheet silicates)
metamorphic
Schist
Mica Schist (primarily consisting of muscovite KAl2(AlSi3O10)(OH)2 or biotite K(Mg,Fe)3(AlSi3O10)(OH)2)
metamorphic
Mica Schist
Crystalline Schist (often containing Muscovite, Biotite, and Quartz)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Quartzite
Quartzite (primarily SiO2)
metamorphic
Basalt (Water-worn Pebble)
Basalt (Mafic Extrusive Igneous Rock)
igneous
Amygdaloidal Basalt
Amygdaloidal Basalt (Mafic Volcanic Rock)
igneous
Pumice
Pumice (a volcanic glass, primarily SiO2 with Al2O3)
igneous
Quartz Pebble
Quartz (Silicon Dioxide, SiO2)
mineral
Moonstone
Orthoclase Feldspar ((K,Na)AlSi3O8)
mineral
Green Agate
Cryptocrystalline Quartz (SiO2)
mineral
Lapis Lazuli
Lapis Lazuli (Complex rock containing Sodalite, Lazurite, Calcite, and Pyrite)
metamorphic
Smoky Quartz
Silicon dioxide (SiO2)
Mineral
Amethyst (Quartz)
Amethyst (Silicon Dioxide with Iron impurities, SiO2)
mineral
Blue Apatite
Apatite-(CaF), Ca5(PO4)3F
mineral
Moonstone (Orthoclase Feldspar)
(K,Na)AlSi3O8
mineral
Agate
Silicon dioxide (SiO2) - variety Chalcedony
mineral