Igneous Or Mineral

Quartz Crystal

Silicon Dioxide (SiO2)

Feldspar

Aluminosilicate (KAlSi3O8 - NaAlSi3O8 - CaAl2Si2O8)

Weathered granite (likely)

Granite, a coarse-grained felsic intrusive igneous rock composed chiefly of quartz, feldspar, and mica

Quartz

Silicon Dioxide (SiO2)

Muscovite Mica

KAl2(AlSi3O10)(F,OH)2

K-feldspar

Potassium Feldspar (Orthoclase / Microcline, KAlSi3O8)

Biotite

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

Graphite

Graphite (Carbon, C)

Feldspar

Triclinic or Monoclinic Tectosilicate (e.g., KAlSi3O8)

Likely magnetite-bearing rock

Magnetite (Fe₃O₄), possibly in a mafic host rock

Granite

Intrusive igneous rock

Granite

Plutonic Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Plutonic Igneous Rock

Basalt

Extrusive igneous rock

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Intrusive igneous rock

Granite Pegmatite

Phaneritic Igneous Rock

Porphyry

Porphyritic Igneous Rock

Granite

Intrusive Igneous Rock

Granite

Intrusive Igneous Rock

Granite Drill Core

Intrusive Igneous Rock

Quartz

Silicon Dioxide (SiO2)

Coarse-grained granite (likely biotite granite)

Granite, composed mainly of quartz and feldspar with dark biotite or amphibole

Quartz (Milky/Rose Quartz)

Silicon Dioxide (SiO2)

Sapphire

Corundum (Al2O3)

Quartz Heart or Arrowhead Shape

Silicon Dioxide (SiO2)

Apatite

Calcium phosphate fluorapatite, Ca5(PO4)3(F,Cl,OH)

Obsidian

Volcanic Glass

Muscovite

Muscovite mica, KAl2(AlSi3O10)(OH)2

Graphite

Graphite (Carbon, C)

Graphite

Carbon (C)

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Muscovite Mica

KAl2(AlSi3O10)(OH)2

Magnetite

Fe3O4 (Iron(II,III) oxide)

Quartz pebble

Silicon dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Fluorite

Calcium Fluoride (CaF2)

Quartz

Silicon Dioxide (SiO2)

Quartz

Silicon Dioxide (SiO2)

Quartz pebble

Silicon dioxide (SiO2)