Granitic Pegmatite
Granite Pegmatite (typically containing Quartz SiO2, Feldspar KAlSi3O8, and Muscovite)
Igneous
Category
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Sandstone
Arenite (SiO2 primarily)
sedimentary
Smoky Quartz
Silicon Dioxide (SiO2) with aluminum impurities and natural radiation
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Quartz with Chlorite / Greenschist
Quartz vein in Greenschist (SiO2 with Chlorite group minerals)
metamorphic
Chalcedony (Tumbled)
Cryptocrystalline Quartz (SiO2)
mineral
Petrified Wood (Silicified Wood)
Silicified Wood (primarily Chalcedony/Quartz, SiO2)
mineral
Sandstone (Quartzose Sandstone)
Clastic Sedimentary Rock (Lithic arenite / Quartz arenite)
sedimentary
Dendritic Agate
Silicon Dioxide (SiO2) with manganese/iron inclusions
mineral
Astrophyllite
Potassium Sodium Iron Manganese Titanium Silicate Hydroxide (K3NaFe7Ti2Si8O24(OH)7)
mineral
Sandstone (Ferruginous)
Arenite (Fe-rich)
sedimentary
Green Fluorite
Fluorite (Calcium Fluoride, CaF2)
mineral
Sedimentary Rock (Limestone or Siltstone pebble)
Sedimentary rock fragment
sedimentary
Nephrite Jade (or Serpentine)
Nephrite (a variety of amphibole mineral tremolite-actinolite) or Serpentine Group minerals
Mineral/Rock
Common Opal
Hydrated Amorphous Silica (SiO2·nH2O)
mineraloid
Sandstone (Ferruginous)
Arenite with Iron Oxide cement
sedimentary
Petrified Wood
Silicified Wood (SiO2 - Quartz/Chalcedony replacement)
Mineral / Fossil
Black Onyx and Mother of Pearl
Cryptocrystalline Quartz (SiO2) and Nacre (Calcium Carbonate)
mineral
Smoky Quartz
Smoky Quartz (SiO2: Silicon Dioxide)
mineral
Coarse-grained Granite
Granitoid (KAlSi3O8 + SiO2 + NaAlSi3O8)
igneous
Diorite (Salt and Pepper Rock)
Diorite
igneous
Granite
Granite (composed primarily of Quartz SiO2, Alkali Feldspar, and Plagioclase Feldspar)
igneous
Hematite
Iron Oxide (Fe2O3)
mineral
Septarian Nodule Slice
Calcite-bearing Septarian Concretion
sedimentary
Chatoyant Quartz (Cat's Eye Quartz)
Silicon Dioxide (SiO2) with fibrous inclusions of Amphibole or Rutile
mineral
Sandstone (with banding)
Arenite (primarily SiO2)
sedimentary
Greenstone
Chlorite schist / Meta-basalt
metamorphic
Halite
Sodium Chloride (NaCl)
Mineral
Quartzite
Quartzite (SiO2)
metamorphic
Quartz Geode
Silicon Dioxide (SiO2)
mineral
Schist
Mica Schist
metamorphic
Brown Quartz (Jasper or Chert)
Silicon Dioxide (SiO2)
sedimentary
Gneiss
Gneissic Metamorphic Rock
metamorphic
Granite
Phaneritic Felsic Igneous Rock
igneous
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Bumblebee Jasper
Carbonate-rich volcanic rock containing Sulfur and Arsenic (Realgar/Orpiment)
sedimentary
Petrified Wood / Fossilized Wood
Silicified Wood (Silicon Dioxide - SiO2)
fossil
Granite
Phaneritic Igneous Rock (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)
igneous
Turquoise
Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)
mineral
Schist (Micaceous Schist)
Schist (comprising Muscovite/Biotite mica, Quartz, and Feldspar)
metamorphic
Limonite / Goethite (Ironstone)
Hydrated Iron(III) Oxide-Hydroxide FeO(OH)wnH2O
sedimentary
Apatite
Fluorapatite / Chlorapatite (Ca5(PO4)3(F,Cl,OH))
mineral