Green Aventurine
Quartz (Silicon Dioxide, SiO2) with fuchsite inclusions
mineral
Category
Mineral Like Biological Tissue
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Feldspar (specifically Orthoclase)
Potassium Aluminum Silicate (KAlSi3O8)
mineral
Biotite Mica in Host Rock
Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Milky Quartz with Iron Staining
Silicon Dioxide (SiO2)
mineral
Gold Nugget
Native Gold (Au)
mineral
Greenschist
Chlorite schist
metamorphic
Quartz Geode Fragment
Silicon dioxide (SiO2) within a nodule
sedimentary
Greenstone (Amygdaloidal Basalt)
Amygdaloidal Basalt (frequently composed of Plagioclase Feldspar, Pyroxene, and Olivine with Chlorite inclusions)
igneous
Dinosaur Bone
Agatized Dinosaur Bone
sedimentary/fossil
Greenschist
Chlorite Schist
metamorphic
Basalt Pebble
Extrusive Igneous Rock (Mafic)
igneous
Potassium Feldspar
K-Feldspar (KAlSi3O8)
mineral
Gneiss
High-grade regional metamorphic rock (Foliated)
metamorphic
Granite
Phaneritic Felsic Igneous Rock (Granite)
igneous
Orthoclase Feldspar
KAlSi3O8 (Potassium Aluminum Silicate)
mineral
Sandstone
Arenite (SiO2 principal)
sedimentary
Hypersthene
(Mg,Fe)SiO3 - Enstatite-Ferrosilite series
mineral
Fluorite
Fluoride (Calcium Fluoride - CaF2)
mineral
Limonite or Ironstone Nodule
Hydrated iron oxide-hydroxide (FeO(OH)·nH2O)
mineral
Sandstone
Arenite
sedimentary
Sandstone Pebble
Arenite (typically SiO2)
sedimentary
Limonite with Gold-bearing Quartz
Hydrated Iron Oxide Hydroxide, FeO(OH)·nH2O
mineral
Quartz Geode Fragment
Silicon Dioxide (SiO2)
mineral
Rose Quartz
Silicon Dioxide (SiO2) with trace amounts of Titanium, Iron, or Manganese
mineral
Sandstone
Arenite (primarily SiO2 with trace Fe2O3)
sedimentary
Obsidian
Obsidian (Volcanic Glass)
igneous
Coprolite
Coprolite (fossilized feces)
fossil
Granitic Pegmatite with Schorl
Granitic Pegmatite (Schorl: NaFe3Al6(Si6O18)(BO3)3(OH)3OH)
igneous
Limonite (Goethite/Ironstone)
Hydrated iron oxide-hydroxide, approximately FeO(OH)·nH2O
mineral
Dragonstone (Brecciated Basalt/Diabase with Epidote and Quartz)
Brecciated mafic igneous rock
igneous
Red Jasper / Carnelian Chalcedony
SiO2 (Silicon Dioxide with Iron Oxide inclusions)
gemstone
Cullet (Slag Glass)
Amorphous Silica (SiO2) with various metal oxide colorants
mineraloid / anthropogenic
Quartzite
Quartzite (Primary mineral: SiO2)
metamorphic
Clear Quartz
Silicon Dioxide (SiO2)
mineral
Prehnite
Prehnite - Ca2Al(AlSi3O10)(OH)2
mineral
Serpentinite
Serpentinite (composed largely of serpentine group minerals including antigorite, lizardite, and chrysotile)
metamorphic
Milky Quartz with Iron Inclusions
Silicon Dioxide (SiO2)
mineral
Cherry Quartz with Rose Quartz
Crystalline Quartz (SiO2) with glass-based synthetic components
gemstone
Moss Agate
Silicon Dioxide (SiO2) with inclusions
mineral
Chrysocolla
Hydrated copper phyllosilicate, (Cu,Al)2H2Si2O5(OH)4·nH2O
mineral
Dendritic Agate
Silicon Dioxide (SiO2) with Manganese/Iron oxide inclusions
mineral