Mica Schist
Mica Schist (primarily composed of Muscovite/Biotite)
metamorphic
Category
Mineral (Biogenic)
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Basalt
Basalt (composition of plagioclase feldspar and pyroxene)
igneous
Eudialyte with Syenite
Eudialyte: Na15Ca6Fe3Zr3Si(Si25O73)(O,OH,H2O)3(Cl,OH)2
igneous
Granite
Phaneritic Igneous Rock (primarily Quartz, Feldspar, and Mica)
igneous
Diorite
Diorite (Intermediate intrusive igneous rock)
igneous
Ferruginous Quartz (River Pebble)
Silicon Dioxide (SiO2) with Iron Oxide inclusions
mineral
Greenschist
Greenschist (Chlorite-actinolite schist)
metamorphic
Granite River Pebble
Granite
igneous
Amber (Copal)
Fossilized Tree Resin
mineraloid
Amber
Succinate (Fossilized Tree Resin)
fossil
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide - SiO2)
mineral
Peridotite (Dunite)
Olivine-rich Peridotite ((Mg,Fe)2SiO4)
igneous
Banded Agate
Cryptocrystalline Quartz (SiO2)
mineral
Gypsum (Satin Spar / Alabaster variety)
Calcium Sulfate Dihydrate (CaSO4·2H2O)
mineral
Quartz
Silicon Dioxide (SiO2)
mineral
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Limonite (Ironstone)
FeO(OH)·nH2O (Hydrous ferric oxides)
mineral
Chert (Jasper variety)
Microcrystalline Quartz (SiO2)
sedimentary
Sodalite
Sodalite (Na8(Al6Si6O24)Cl2)
mineral
Quartz / Quartzite
Silicon Dioxide (SiO2)
Metamorphic or Mineral
Serpentinite
Serpentinite (Mg, Fe, Ni, Al, Zn, Mn)2-3(Si, Al, Fe)2O5(OH)4
metamorphic
Jasper (Iron-stained Quartzite/Chert)
Silicon Dioxide (SiO2) with iron oxide inclusions
Sedimentary
Obsidian
Obsidian (Volcanic Glass, SiO2)
igneous
Milky Quartz
Quartz (Silicon Dioxide, SiO2)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Pearl (nacre)
Calcium Carbonate (mostly CaCO3 as Aragonite) and Conchiolin
Organic Mineraloid
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Quartz pebble
Silicon dioxide (SiO2)
Mineral
Milky Quartz
Silicon Dioxide (SiO2)
mineral
Native Sulfur
Sulfur (S8)
mineral
Red Sandstone
Arenite (with Iron Oxide / Hematite cementation)
sedimentary
Greenstone / Diabase Porphyry
Porphyritic Diabase (Micro-gabbro)
Igneous
Quartz Druze (Crystalline Quartz)
Silicon Dioxide (SiO2)
mineral
Clear Quartz
SiO2 (Silicon Dioxide)
mineral
Blue Calcite
Calcium Carbonate (CaCO3)
mineral
Fuchsite Gneiss or Schist
Muscovite (variety Fuchsite) within Metamorphic Host Rock
metamorphic
Aggregate Concrete
Anthropogenic Conglomerate (Technosol)
sedimentary
Vesicular Basalt (or Scoria)
Vesicular Basalt (Aphanitic-vesicular volcanic rock)
igneous
Fossilized Shark Tooth (Sand Tiger)
Carcharias sp. (Fossilized Tooth)
fossil
Fossilized Horse Tooth
Equus ferus caballus (fossilized molar/premolar)
fossil
Granite
Granite
Igneous