Blue Quartz (or Blue Aventurine)
Silicon Dioxide (SiO2) with inclusions (typically Crocidolite or Dumortierite)
mineral
Category
Mineral Like Biological Tissue
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Quartz with inclusions
Silicon Dioxide (SiO2)
mineral
Petrified Wood
Silicified Wood (SiO2)
fossil
Green Jasper
Silicon Dioxide (SiO2) with mineral inclusions
sedimentary
Magnetite
Magnetite (Fe3O4)
mineral
Limonite (Iron Ore)
Limonite (FeO(OH)·nH2O)
mineral
Fluorite
Calcium Fluoride (CaF2)
mineral
Green Aventurine
Aventurine Quartz (SiO2 + Fuchsite inclusions)
mineral
Gossan (with Limonite and Hematite)
Gossanous iron-oxide rock (Fe2O3 · nH2O)
sedimentary
Aventurine
Aventurine Quartz (SiO2)
mineral
Coarse Sandstone
Arenite (SiO2 based)
sedimentary
Magnetite
Iron(II,III) oxide (Fe3O4)
mineral
Chert (Jasper variety)
Chert (SiO2)
sedimentary
Labradorite
(Ca, Na)(Al, Si)4O8
mineral
Celadonite in Basalt (Green Earth)
Celadonite (K(Mg,Fe2+)(Fe3+,Al)Si4O10(OH)2)
mineral
Prehnite
Prehnite (Ca2Al(AlSi3O10)(OH)2)
mineral
Granite
Granitic intrusive igneous rock
igneous
Blue Dyed Agate
Cryptocrystalline Quartz (SiO2)
mineral
Sandstone with Ironstone Concretion
Arenite with Ferruginous Cement
sedimentary
Cullet Glass (Strawberry Glass)
Amorphous Silicon Dioxide (SiO2) with metallic dopants
Mineraloid (Synthetic/Man-made)
Sandstone (with Limonite/Iron Staining)
Arenite (SiO2 based) with FeO(OH) staining
sedimentary
Gneiss
Gneiss
metamorphic
Milky Quartz with Pyrite and Iron Staining
Silicon Dioxide (SiO2) with Iron Disulfide (FeS2) inclusions
mineral
Fossilized Coral
Scleractinia (fossil order), primarily Calcium Carbonate (CaCO3)
sedimentary
Black Obsidian
Volcanic Glass (SiO2 + MgO / Fe3O4)
igneous
Sunstone
Heliolite (Oligoclase or Orthoclase Feldspar), (Ca,Na)(Al,Si)4O8
mineral
Bornite (Peacock Ore)
Bornite (Cu5FeS4)
mineral
Gneiss (or Granite Gneiss)
Metamorphic rock rich in quartz, feldspar, and biotite/amphibole
metamorphic
Blue Apatite
Apatite - Ca5(PO4)3(F,Cl,OH)
mineral
Quartz (Iron-stained)
Silicon Dioxide (SiO2)
mineral
Peacock Ore
Bornite (Cu5FeS4) or Acid-Treated Chalcopyrite (CuFeS2)
mineral
Petrified Wood
Silicified Wood (primarily Quartz / Chalcedony: SiO2)
sedimentary
Gneiss (Granulite / Foliated Metamorphic Rock)
Gneiss
metamorphic
Sandstone
Sedimentary Clastic Rock (Quartz-rich)
sedimentary
Granite Pebble
Granite (Phaneritic Quartz-Feldspar Rock)
igneous
Quartz (Iron-Stained)
Crystalline Silicon Dioxide (SiO2)
mineral
Banded Gneiss
Gneiss (High-grade Metamorphic Rock)
metamorphic
Hematite Concretion
Iron(III) oxide (Fe2O3)
mineral
Quartz (Clear Quartz/Rock Crystal)
Silicon Dioxide (SiO2)
mineral
Sandstone
Arenite (clastic sedimentary rock)
sedimentary
Sandstone (with potential iron mineralization)
Arenite
sedimentary
Yellow Ochre / Limonite
Limonite (inter-mixed iron oxides and hydroxides, primarily FeO(OH)·nH2O)
mineral