Crinoid Fossil in Limestone
Crinoid (Class Crinoidea) in Fossiliferous Limestone (CaCO3)
sedimentary
Category
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Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Carnelian
Carnelian (variety of Chalcedony, SiO2)
mineral
Carnelian
Carnelian (Silica, SiO2)
mineral
Amethyst (Tumbled/Weathered Quartz)
Amethyst (SiO2 with iron impurities)
mineral
Carnelian and Dyed Agate
Chalcedony (Silicon Dioxide, SiO2)
mineral
Shale
Argillite / Shale
sedimentary
Sandstone (Quartzose Sandstone)
Clastic Terrigenous Sedimentary Rock (primarily SiO2)
sedimentary
Granite
Granite (High-silica plutonic rock)
igneous
Basalt
Mafic volcanic rock (Primary minerals: Plagioclase feldspar, Pyroxene)
igneous
Garnet (Almandine)
Almandine (Fe3Al2(SiO4)3)
metamorphic
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Fluorite Carving
Fluorite (Calcium Fluoride, CaF2)
mineral
Chert Arrowhead
Cryptocrystalline Quartz (SiO2)
sedimentary
Emerald (Beryl)
Beryl (Be3Al2(SiO3)6) with Chromium/Vanadium impurities
mineral
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Pyrite (Fool's Gold)
Iron Disulfide (FeS2)
mineral
Pyrite
Iron Sulfide (FeS2)
mineral
Orange Calcite
Calcium Carbonate (CaCO3)
mineral
Red Jasper
Silicon Dioxide (SiO2) with Iron Oxide (Fe2O3) inclusions
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Tree Agate
Chalcedony with Dendritic Chlorite (SiO2 with impurities)
sedimentary/mineral
Magnetite (Iron Ore)
Magnetite (Fe3O4)
mineral
Peridotite
Peridotite (primarily Olivine and Pyroxene)
igneous
Labradorite (Feldspar)
Labradorite, (Ca,Na)(Al,Si)4O8
mineral
Labradorite
Labradorite ((Ca, Na)(Al, Si)4O8)
mineral
Fancy Jasper
Chalcedony (cryptocrystalline quartz) with inclusions
Mineral
Desert Rose (Baryte or Selenite variant)
Barium Sulfate (BaSO4) or Gypsum (CaSO4·2H2O) with Sand inclusions
mineral
Green Aventurine
Aventurine Quartz (SiO2 with Fuchsite inclusions)
mineral
Citrine
Silicon Dioxide (SiO2)
mineral
Banded Agate (specifically Sardonyx or Carnelian Agate)
Silicon Dioxide (SiO2) - Cryptocrystalline Quartz
mineral
Ferruginous Sandstone (River Pebble)
Clastic Sedimentary Rock (Iron-rich)
sedimentary
Serpentine
Antigorite/Lizardite (Mg, Fe)3Si2O5(OH)4
metamorphic
Amethyst
Amethyst (Silicon Dioxide, SiO2)
mineral
Muscovite Mica
Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2
Mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Amethyst
Amethyst (variety of Quartz, SiO2)
mineral
Amethyst
Silicon dioxide (SiO2) with iron impurities
mineral
Carnelian
Silicon dioxide (SiO2) - variety of Chalcedony
mineral