Lapis Lazuli
Lapis Lazuli (A complex rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2)
metamorphic
Category
Not A Geological Specimen
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Quartz / Common Gravel
Silicon Dioxide (SiO2)
mineral
Ferruginous Quartz (Iron-stained Quartz)
Quartz with Iron Oxide inclusions (SiO2 with Fe2O3)
mineral
Pyrite (Fool's Gold)
Iron Sulfide (FeS2)
mineral
Raw Fluorite
Calcium Fluoride (CaF2)
mineral
Shale with Vein Infillings
Shale (a fine-grained clastic sedimentary rock). The veins could be Calcite (CaCO3), Quartz (SiO2), or other minerals.
Sedimentary Rock
Conglomerate
Sedimentary Conglomerate with Basaltic Clast
sedimentary
Chert (Nodule)
Silicon Dioxide (SiO2)
sedimentary
Chert (specifically Yellow Jasper variety)
Silicon Dioxide (SiO2)
sedimentary
Yellow Chert
Sedimentary cryptocrystalline quartz (SiO2)
sedimentary
Granite
Granite (a common term for a felsic intrusive igneous rock)
igneous
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Quartz (Pale Rose or Milky Variety)
Silicon Dioxide (SiO2)
mineral
Botryoidal Agate / Chalcedony Geode
Silicon Dioxide (SiO2)
mineral
Chalcedony (Agate/Carnelian variant)
Silicon Dioxide (SiO2)
mineral
Orange Calcite (with White Calcite/Quartz matrix)
Calcium Carbonate (CaCO3)
mineral
Pyrite-rich Ore
Pyrite (FeS2) with secondary minerals
mineral
Sandstone with Magnetite and Iron Staining
Clastic Sedimentary Rock (contains Fe3O4 and Limonite/Hematite)
sedimentary
Dinosaur Skull Fossil (Velociraptor Replica)
Velociraptor mongoliensis fossil specimen in sedimentary matrix
sedimentary
Banded Chert in Matrix
Microcrystalline Quartz (SiO2)
sedimentary
Quartz pebble
Silicon Dioxide (SiO2)
mineral
Amber
Succinite (fossilized resin); C10H16O
mineraloid
Petrified Wood
Silicified Wood (SiO2)
sedimentary
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2) with Hematite/Limonite
mineral
Clear Quartz with Limonite
Silicon Dioxide (SiO2) with Hydrated Iron Oxides
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Amethyst
Silicon Dioxide (SiO2) with iron impurities
mineral
Pink Satin Spar (Satin Spar Selenite Dyed)
Gypsum (CaSO4·2H2O)
mineral
Fulgurite
Liesegang (Fulgurite)
Mineraloid
Dark Igneous Rock (Likely Basalt or Diabase)
Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.
Igneous
Rough Quartz
Silicon Dioxide (SiO2)
mineral
Blue Lace Agate (Polished Point)
Silicon Dioxide (SiO2)
mineral
Fossilized Coral (Petoskey Stone type)
Hexagonaria percarinata (Order: Rugosa)
sedimentary
Pink Granite
Granite (High K-Feldspar variety)
igneous
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary
Smoky Quartz
Silicon Dioxide (SiO2)
mineral
Granite (Pink/Red Granite)
Phaneritic Igneous Rock (primarily SiO2, KAlSi3O8, NaAlSi3O8)
igneous
Chert (Arrowhead Preform or Point)
Chert (Microcrystalline Quartz, SiO2)
sedimentary
Reddish Brown Claystone or Siltstone
Argillite / Siltstone / Claystone
sedimentary
Gneissic Schist
Gneiss-schist (Metamorphic rock)
metamorphic
Chert (Jasper/Agate variant)
Microcrystalline Quartz (SiO2)
sedimentary
Chert with Druzy Quartz Geode
Microcrystalline Quartz (SiO2)
sedimentary