Mineral On Igneous Rock

Lapis Lazuli

(Na,Ca)8(AlSiO4)6(S,SO4,Cl)1-2 (Complex silicate rock)

Blue sodalite bead necklace

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂

Granitic Gneiss

Gneiss (quartz-feldspar-mica complex)

Granite

Granite (Felsic Plutonic Rock)

Amygdaloidal Basalt

Extrusive mafic igneous rock with amygdules

Basalt with Quartz Veins

Mafic Igneous Rock (primarily Plagioclase and Pyroxene) with SiO2 inclusions

Granite (coarse-grained, mica-bearing)

Granite, composed mainly of quartz, feldspar, and mica (biotite and/or muscovite)

Granite with Mafic Xenolith

Intrusive Igneous Rock (Felsic to Intermediate)

Basalt

Basalt (Mafic Extrusive Igneous Rock)

Granite and Mixed Landscape Gravel

Plutonic Igneous Rock / Weathered Alluvium

Gabbro (River Cobble)

Gabbro (mafic intrusive rock)

Basalt with Quartz/Calcite Veins

Amygdaloidal Basalt (SiO2 or CaCO3 inclusions)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Basalt

Extrusive Igneous Rock

Basalt

Extrusive Igneous Rock

Basalt

Extrusive igneous rock

Basalt

Extrusive Igneous Rock

Basalt

Extrusive Igneous Rock

Quartz-bearing rock, possibly pegmatite

Likely quartz and feldspar with dark mica or other accessory minerals; exact rock type is uncertain from the image

Dalmation Stone

Peralkaline Rock (SiO2 with Arfvedsonite)

Rounded quartz-rich river pebble

Likely quartz-bearing rock; exact lithology cannot be determined from the photograph

Likely granite or granitic rock fragment

Granite; primarily quartz, feldspar, and mica

Serpentine

Antigorite, Lizardite, or Chrysotile (Mg, Fe)3Si2O5(OH)4

Granite

Felsic intrusive igneous rock

Small rounded stone or mineral fragment

Indeterminate; likely a common quartz- or feldspar-bearing silicate fragment

Dalmatian Jasper

Peralkaline Quartz-feldspathic Rock (Arfvedsonite-bearing)

Likely dark mineral or rock fragment

Indeterminate from image; possibly a dark silicate mineral such as hornblende, biotite, or basalt

Granite Pebble

Granite (Felsic intrusive igneous rock)

Uncertain dark-and-white rock fragment

Likely a mixed lithic specimen, possibly quartz-bearing granite or ore; exact identification is not possible from the photograph

Basalt with Quartz/Calcite Veins

Basalt with hydrothermal vein infill

Pink Granite / K-Feldspar

Alkali feldspar granite / Potassium feldspar (Microcline/Orthoclase)

Granitic Pegmatite

Pegmatitic Granite

Milky Quartz

Silicon Dioxide (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Yellow Quartz

Silicon Dioxide (SiO2)

Granite

Felsic intrusive igneous rock

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Dark, coarse-grained rock (possibly mafic igneous rock)

Undetermined; potentially basaltic or gabbroic material

Dalmation Stone

Peralkaline Rock (mixed silicate minerals)

Pink-and-white quartz-rich pebble

Quartz (SiO₂), likely massive quartz with iron-oxide staining and possible feldspar inclusions

Light-colored granite or granitic gneiss

Granite; typically quartz + feldspar + mica (variable composition)