Mineral In Igneous Rock

Quartz (specifically Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Pyrite

Iron Disulfide (FeS2)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Vesicular Basalt (Iron-rich)

Scoriaceous Basalt / Oxidized Vesicular Basalt

Pyrite

Iron Sulfide (FeS2)

Granite Cobble/Pebble

Granite

Granite

Granite

Dalmatian Jasper (Dyed Blue)

Peralkaline Rock with Arfvedsonite and Blue Dye

Granite

Granite (Felsic Intrusive)

Granite

Phaneritic Felsic Intrusive Igneous Rock

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(F,OH)2)

Granite

Granite (Phaneritic Quartz-Feldspar intrusive rock)

Quartz

Quartz (SiO2 - Silicon Dioxide)

Amethyst

SiO2 (Silicon Dioxide) - a variety of Quartz

Quartz (Clear / Rock Crystal)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Green Calcite

Calcium Carbonate (CaCO3)

Granite

Granite (Phaneritic Quartz-Feldspar-Biotite rock)

River Cobble (Salt and Pepper Gneiss)

Gneiss (High-grade regional metamorphic rock)

Granite

Phaneritic plutonic rock (Quartz, Alkali Feldspar, and Plagioclase)

Copper Ore (likely Chalcopyrite in Matrix)

Chalcopyrite (CuFeS2)

Pyrite

Iron Sulfide (FeS2)

Mica Group Minerals

There isn't a single scientific name as 'Mica' refers to a group of phyllosilicate minerals. Common scientific names include Muscovite (KAl₂ (AlSi₃O₁₀)(OH)₂), Biotite (K(Mg,Fe)₃AlSi₃O₁₀(OH)₂), Phlogopite (KMg₃AlSi₃O₁₀(OH)₂), and Lepidolite (K(Li,Al)₃(Al,Si,Rb)₄O₁₀(F,OH)₂).

Granitic Pegmatite

Granite Pegmatite (principally KAlSi3O8, SiO2, and KAl2(AlSi3O10)(OH)2)

Granodiorite / Granite

Granodiorite (containing Quartz SiO2, Plagioclase Feldspar, and Biotite)

Granite

Granite (Phaneritic intrusive igneous rock) - Composition: SiO2, Al2O3, K2O, Na2O

Cloudy Quartz

Silicon Dioxide (SiO2)

Pink Granite Gneiss

Granitic Gneiss

Gneiss

Gneiss

Pyrite

Iron Sulfide (FeS2)

Banded Gneiss

Gneiss (High-grade regional metamorphic rock)

Apatite

Fluorapatite, Chlorapatite, and Hydroxylapatite (Ca5(PO4)3(F,Cl,OH))

Quartz (Milk or Clear)

Silicon Dioxide (SiO2)

Dalmatian Stone

Dalmatian Stone (a fine-grained igneous rock, often misidentified as Dalmatian Jasper)

Scoria (Lava Rock)

Vesicular Basalt / Scoria

Basalt

Basalt

Ferruginous Quartz (Iron-Stained Quartz)

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Granite

Phaneritic plutonic rock (Quartz, Feldspar, Mica)

Pink Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)