Mineral In A Matrix (Likely Quartz Or Feldspar)

Coarse-grained mica-bearing metamorphic rock, likely schist

Mica schist, probably muscovite–biotite schist with quartz and feldspar

Unakite / Feldspar Veined Metamorphic Pebble

Metamorphic Rock with K-Feldspar, Epidote, and Quartz

Milky Quartz in Siltstone or Feldspar

Silicon Dioxide (SiO2)

Smoky Quartz and Biotite Schist

Quartz-Biotite Schist (SiO2 + K(Mg,Fe)3AlSi3O10(F,OH)2)

Light-colored granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and minor mica, possibly with gneissic fabric

Granite Pebble

Granite (Plutonic Igneous Rock)

Granite Pebble with Quartz Vein

Granite (Plutonic Igneous Rock) with Quartz (SiO2)

Granitic Pegmatite (Muscovite and Quartz)

Pegmatite (KAl2(AlSi3O10)(OH)2 / SiO2)

Granite

Granite

Porphyry (Rhyolite / Andesite Porphyry Pebble)

Porphyritic Igneous Rock

Rounded dark pebble, likely basaltic andesite

Fine-grained mafic volcanic rock; probable basalt or andesite, identification uncertain from image alone

Quartz-rich rock fragment

Microcrystalline quartz (SiO₂), possibly chalcedony or quartz-bearing breccia

Unknown Rock Specimen

Quartz-rich pegmatite (possibly quartz–feldspar rock)

Granite pegmatite; chiefly quartz (SiO₂) with feldspar and minor mica/iron staining

Small pale rock fragment

Indeterminate; possibly quartz, calcite, or a weathered feldspar-rich fragment

Feldspar (Granite Pegmatite matrix)

Potassium Feldspar (KAlSi3O8) / Quartz Mixture

Basalt with Plagioclase or Quartz Inclusion

Melanocratic Basalt with Porphyritic Inclusion

Quartz (Crystal/Druzy Quartz)

Quartz (SiO₂)

Sandstone (likely Ferruginous)

Arenite (SiO2 with iron oxide impurities)

Milky quartz with dark host-rock inclusions

Quartz (SiO₂), likely in a granitic or metamorphic matrix

Porphyry

Porphyritic Igneous Rock

Dalmatian Stone

Dalmatian Jasper (Aplitic Rock)

Quartz (Milky/Chalcedony variety)

Silicon Dioxide (SiO2)

Granite

Phaneritic Felsic Igneous Rock

Schorl (Black Tourmaline) in Quartz and Feldspar

NaFe2+3Al6(Si6O18)(BO3)3(OH)3(OH)

Dalmatian Stone

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Leopardite

Quartz porphyry / Quartz monzonite with manganese oxide spots

Llanite (Rhyolite with Blue Quartz)

Porphyritic Rhyolite

Likely quartz cluster with iron staining

Quartz (SiO₂), possibly with calcite or feldspar inclusions

White quartz-rich pebble

Quartz (SiO₂), possibly milky quartz or quartzite

Basalt Porphyry

Porphyritic Basalt

Granite

Granite (Plutonic Igneous Rock)

Mica schist, likely biotite–muscovite schist

Mica schist; predominantly quartz, feldspar, biotite and/or muscovite mica. Exact mineral composition cannot be confirmed from the photograph alone.

Orbicular rhyolite (likely)

Rhyolite, a silica-rich volcanic rock; commonly quartz, alkali feldspar, plagioclase, and iron-rich alteration minerals

Quartz Geode / Druzy Quartz

Silicon Dioxide (SiO2)

Dalmatian Stone (often misnamed Dalmatian Jasper)

Aplite (with hornblende/arfvedsonite inclusions)

Quartz with Feldspar

Silicon Dioxide (SiO2) with Potassium Feldspar (KAlSi3O8)

Weathered quartz-bearing rock, possibly granite or gneiss

Indeterminate; likely quartz–feldspar–mica aggregate, possibly granitic gneiss

Dalmatian Stone

Dalmatian Jasper (not a true jasper, typically an igneous perthite)

Basalt with Quartz Veining

Veined Basalt (composed primarily of plagioclase feldspar, pyroxene, and olivine with quartz/calcite infill)

Siltstone with Quartz Vein

Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)

Quartz with Inclusions

Silicon Dioxide (SiO2) with various mineral inclusions