Mineral In A Matrix (Likely Quartz Or Feldspar)

Quartz in Host Rock

Silicon Dioxide (SiO2) in Rhyolite or Granite matrix

Milky quartz with possible feldspar

Quartz (SiO₂), possibly intergrown with feldspar

Dalmatian Stone (Dalmation Jasper)

Aplite with Arfvedsonite inclusions

Banded Sedimentary Rock (Wishbone Stone / Banded Quartzite or Limestone)

Silicified limestone or banded sedimentary rock with mineral veins

Weathered granite-like rock

Granite, likely biotite-bearing; exact identification requires testing

Pink-and-green granite or granitic gneiss

Coarse-grained granitoid, chiefly quartz, feldspar, and dark mafic minerals; pink areas likely potassium feldspar

Unakite

Altered Granite (Epidotized Feldspar with Quartz)

Porphyritic basaltic-andesite pebble

Fine-grained volcanic rock, likely plagioclase-phyric basaltic andesite with dark mafic minerals

Polished orbicular jasper (likely ocean jasper)

Silicified volcanic rock; predominantly microcrystalline quartz/chalcedony (SiO₂) with iron oxides and possible feldspar/zeolite inclusions

Polished ruby-in-zoisite cabochon (probable)

Corundum (ruby, Al₂O₃) in zoisite matrix (Ca₂Al₃Si₃O₁₂(OH)); possibly green fuchsite quartzite

Tumbled pink feldspar-rich granite

Granite, composed mainly of quartz, potassium feldspar, and plagioclase, with minor dark minerals

Granite

Granite; chiefly quartz, feldspar, and mica or amphibole

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Garnetiferous Quartzite (Garnet Gneiss Pebble)

Garnet-bearing Quartzite or Quartz-Feldspar Gneiss

Quartz-bearing dark mineral specimen

Quartz (SiO₂) on a dark host rock, possibly basalt or sulfide-rich ore

Granite-like rock

Felsic intrusive igneous rock, probably granitic or granodioritic

Polished brecciated jasper (likely)

Brecciated jasper, an opaque microcrystalline quartz (SiO₂) with contrasting silica-rich fragments and matrix

Milky quartz (likely quartz-rich rock)

Quartz, silicon dioxide (SiO₂)

Mica-rich granite or granitic pegmatite

Quartz–feldspar–mica aggregate, commonly biotite granite or muscovite-bearing pegmatite

Pink Granite Porphyry Cobble

Porphyritic K-Feldspar Granite

Porphyritic volcanic rock, likely andesite or basaltic andesite

Fine-grained plagioclase–pyroxene volcanic rock; exact identification requires microscopy or chemical testing

Granite Pebble

Felsic Intrusive Igneous Rock

Pegmatitic granite with tourmaline and iron staining

Granitic pegmatite; primarily quartz (SiO₂), feldspar, mica, and black tourmaline (schorl, NaFe₃Al₆(BO₃)₃Si₆O₁₈(OH)₄)

Smoky quartz crystal

Quartz, silicon dioxide (SiO₂), smoky variety

Lepidolite

K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2 (Lepidolite - Lithium-rich Mica)

Graphic Granite

Pegmatitic Granite (Quartz and Microcline KAlSi3O8)

Weathered mica-rich metamorphic rock, likely schist

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

Small white mineral fragment

Likely quartz (SiO₂), possibly calcite (CaCO₃)

Pink amethyst geode

Quartz (SiO₂), with iron-related pink coloration; likely a quartz geode

Likely weathered granite or granitic pegmatite fragment

Granite, composed mainly of quartz, feldspar, and dark mica or amphibole

Dalmatian Jasper (Dalmatian Stone)

Dalmatian Stone (primarily Feldspar, Quartz, and Arfvedsonite/Tourmaline)

Unidentified polished mineral specimen

Indeterminate; likely a pale feldspar or quartz-bearing material

Granite

Granite

Quartz-rich breccia or vein quartz fragment

Quartz (SiO₂), likely with iron-oxide staining and attached host rock

Biotite-bearing granite or granitic gneiss

Quartz–feldspar–biotite assemblage; likely granite (possibly weakly metamorphosed gneiss)

Raw quartz-bearing mineral fragment

Quartz, silicon dioxide (SiO₂), possibly included or matrix-bearing

Milky quartz vein rock

Quartz, SiO₂; likely massive quartz with minor iron-oxide and host-rock material

Weathered granite or granitic pegmatite

Granite, composed mainly of quartz, feldspar, and mica

Quartz-rich pegmatite specimens

Granitic pegmatite; primarily quartz (SiO₂), with likely feldspar and minor mica/iron-oxide staining

Porphyritic Rhyolite (Birdseye Rhyolite)

Rhyolite (Porphyritic texture)

Quartz-rich pegmatite, with probable feldspar and mica

Granite/pegmatite assemblage: quartz (SiO₂), feldspar (KAlSi₃O₈–NaAlSi₃O₈–CaAl₂Si₂O₈), and mica

Granite pebble

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