Mineral In A Matrix (Likely Quartz Or Feldspar)

Likely mica-rich schist or pegmatitic quartz-mica rock

Quartz–feldspar–mica aggregate, possibly biotite schist

Coarse-grained granite (possibly granodiorite)

Granite, composed chiefly of quartz, feldspar, and mica; exact mineral proportions cannot be confirmed from the photograph.

Quartz-rich rock fragment, possibly milky quartz with iron staining

Quartz (SiO₂), potentially vein quartz or quartz-bearing pegmatite

Porphyritic Basalt (with Quartz or Calcite inclusion)

Porphyritic Basalt (Matrix: SiO2/MgO/FeO, Phenocryst: likely Quartz or Calcite)

Kyanite-bearing metamorphic rock

Blue kyanite (Al₂SiO₅), likely in mica- and garnet-rich schist

Likely pyrite-bearing metamorphic rock

Quartz–mica schist or gneiss with disseminated pyrite (FeS₂)

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Tumbled blue-gray stone, likely labradorite or sodalite

Possibly labradorite (plagioclase feldspar, approximately NaAlSi₃O₈–CaAl₂Si₂O₈) or sodalite (Na₈(Al₆Si₆O₂₄)Cl₂)

Quartz-rich pegmatite with iron-stained quartz

Quartz (SiO₂) in granitic pegmatite, likely with feldspar and iron-oxide staining

Dalmatian jasper (Dalmatian stone)

Feldspar-rich porphyritic igneous rock, commonly sold as Dalmatian jasper; dark spots are mainly amphibole and/or tourmaline minerals

Likely rose quartz-bearing pegmatite

Quartz (SiO₂), probably with feldspar and iron-oxide staining

Garnetiferous Pegmatite

Pegmatite with Almandine Garnet and Muscovite

Quartz-rich pegmatite with drusy quartz

Quartz (SiO₂) in a granitic pegmatite, likely with feldspar and mica inclusions

Quartz-bearing pegmatite or feldspar-rich rock

Likely granitic pegmatite composed mainly of quartz (SiO₂) and feldspar, with possible mica or iron-oxide staining

Lepidolite in Quartz Matrix

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2

Likely mica-rich granite pegmatite

Granitic pegmatite, composed mainly of quartz and feldspar with visible mica (likely muscovite or biotite)

Quartz-veined metamorphic rock, likely mica schist

Mica schist with a milky-quartz vein; predominantly quartz, feldspar, and biotite/muscovite mica

Quartz-rich pegmatite (milky quartz with feldspar)

Quartz (SiO₂)–feldspar pegmatite, likely containing albite or orthoclase

Pegmatitic quartz–feldspar rock with dark mica

Granitic pegmatite; quartz (SiO₂), feldspar, and biotite mica

Tumbled granite (likely granodiorite)

Granite–granodiorite aggregate, chiefly quartz, feldspar, and biotite/hornblende

Porphyritic polymictic breccia (likely volcanic breccia)

Volcanic breccia; probable polymictic andesite–dacite breccia with quartz/feldspar clasts

Quartz Vein in Matrix (Gneiss/Schist)

Silicon Dioxide (SiO2) in Metamorphic Rock Matrix

Aquamarine with feldspar and black tourmaline

Beryl (Be₃Al₂Si₆O₁₈), likely with feldspar and schorl (black tourmaline)

Mica-rich rock, likely mica schist

Mica schist, composed chiefly of muscovite and/or biotite with quartz and feldspar

Porphyritic Basalt (with Granite inclusion)

Porphyritic Mafic Volcanic Rock

Weathered porphyritic volcanic rock, likely rhyolite or andesite

Porphyritic rhyolite–andesite; mainly quartz/feldspar phenocrysts in a fine iron-stained groundmass

Beryl in Quartz Matrix

Beryllium Aluminum Silicate (Be3Al2Si6O18)

Tumbled orange-brown feldspathic rock, likely granite or weathered syenite

Feldspar-rich granitoid; chiefly K-feldspar and plagioclase with minor quartz and dark biotite/amphibole

Quartz-rich pegmatite fragment

Milky quartz with feldspar and mica; primarily SiO₂, with K-feldspar/plagioclase and muscovite

Polymictic conglomerate

Conglomerate; clast-supported polymictic conglomerate in a dark matrix

Quartz-rich rock, likely granite or quartz-bearing metamorphic rock

Undetermined; possibly granitic rock composed mainly of quartz and feldspar, with mica or other dark minerals

Quartz Vein in Host Rock (clastic sediment)

Silicon Dioxide (SiO2) in matrix

Dalmatian Stone

Peralkaline Quartz-Feldspar Porphyry with Arfvedsonite

Porphyritic Basalt (with Lath-like Phenocrysts)

Porphyritic Basalt

Polymictic conglomerate or breccia (possibly concrete-like aggregate)

Lithified polymictic gravel; clasts may include basalt, granite, quartzite, and other silicates

Porphyritic Basalt or Andesite

Porphyritic Basalt or Porphyritic Andesite

Rhyolite

Rhyolite (felsic extrusive igneous rock)

Paving-concrete aggregate with a rounded stone

Polymictic gravel aggregate; the central clast appears to be weathered sandstone or volcanic rock

Conglomeratic gravel / pebble-rich concrete-like rock

Polymictic conglomerate (likely an unconsolidated gravel surface; exact identification uncertain from the image)

Dalmatian jasper (often sold as Dalmatian stone)

Porphyritic quartz monzonite or alkali granite, composed mainly of feldspar and quartz with black aegirine/arfvedsonite amphibole-group minerals

Granite or Pegmatite with Tourmaline

Granitic Pegmatite

Banded gneiss

Foliated gneiss, likely quartz–feldspar–mica gneiss