Mineral In A Matrix (Likely Quartz Or Feldspar)

Weathered pegmatitic granite (likely biotite granite)

Coarse-grained granite dominated by quartz, potassium feldspar, plagioclase, and biotite; exact identification requires testing

Granite Pebble

Granite (Felsic Plutonic Rock)

Weathered granite or granitic gneiss slab

Granitic rock, chiefly quartz, feldspar, and mica; exact identification is uncertain from the photograph

Weathered granitic rock fragment

Likely granite or granodiorite, composed mainly of quartz, feldspar, and mica

Likely gneissic amphibolite or banded metamorphic rock

Hornblende–biotite gneiss/amphibolite; exact identification requires a fresh surface or thin section

Granite pebble

Granite, chiefly quartz, feldspar, and mica

Porphyritic granite pebble

Granite, chiefly quartz (SiO₂), alkali feldspar and plagioclase, with minor biotite/hornblende

Weathered granite pebble

Granite, predominantly quartz–feldspar–mica aggregate

Que Sera Stone (Llanite / Blue Quartz with Feldspar and Iron Oxides)

Porphyritic Rhyolite (Quartz-Feldspar Porphyry)

Quartz vein in dark host rock

Quartz (SiO₂), likely in basalt, gabbro, or altered mafic rock

Granitoid (Granite/Gneiss mix)

Phaneritic Felsic Igneous Rock

Pink quartz (likely rose quartz)

Quartz, silicon dioxide (SiO₂), typically massive rose quartz colored by trace elements and microscopic inclusions

Porphyritic Basalt (Porphyry pebble)

Porphyritic Basalt / Amygdaloidal Basalt

Pink Granite

Granite (composed of Potassium Feldspar, Quartz, and Plagioclase)

Polished granite countertop with fossil shell

Granite; shell likely a fossilized bivalve or gastropod

Quartz-rich granite or granitic gneiss

Granite; primarily quartz (SiO₂), feldspar, and mica, possibly weakly metamorphosed

Dalmation Stone

Peralkaline rhyolite (SiO2 with Arfvedsonite/Riebeckite)

Greywacke

Lithic wacke (variety of Sandstone)

Graywacke

Graywacke Sandstone

Likely weathered granite or granitic pebble

Granite; typically quartz, feldspar, and mica (approx. SiO₂-rich plutonic rock)

Basalt with Peridotite Xenolith

Mafic Igneous Rock with Peridotite Inclusion (Olivine-rich)

Epidote in Matrix (Unakite-like Rock Fragment)

Epidote (Ca2(Al,Fe)3(SiO4)3(OH)) / Altered Metamorphic Pebble

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Weathered granite or granitic gneiss

Granite; chiefly quartz, feldspar, and mica (possibly gneissic if foliation is confirmed)

Quartz-rich granite or pegmatitic rock

Granite, composed mainly of quartz, feldspar, and mica; exact identification is uncertain from the photograph

Sandstone

Clastic Sedimentary Rock (primarily Quartz, SiO2)

Dalmatian Jasper

Peralkaline Quartz Feldspar Porphyry

Schorl (Black Tourmaline) in Quartz or Feldspar Matrix

NaFe3Al6(BO3)3Si6O18(OH)4 (Schorl) in Granitic Pegmatite

Andesite Porphyry

Andesite (extrusive volcanic rock)

Quartzite Pebble

Metamorphic rock primarily composed of Silicon Dioxide (SiO2)

Rounded granitic gneiss or granite cobble

Quartz–feldspar–mica granitoid; possibly weathered gneiss

Granite pebble

Granite, chiefly quartz, alkali feldspar, plagioclase, and mica

Amazonite (with smoky quartz/feldspar inclusions)

K(AlSi3O8), Microcline (Tectosilicate)

Likely weathered granite or granitic fragment

Granite; chiefly quartz (SiO₂), feldspar, and mica

Raw quartz crystal

Quartz (silicon dioxide, SiO₂), likely milky or included quartz

Sandstone (clastic)

Clastic Sedimentary Rock (primarily composed of SiO2)

Sandstone (River Cobble / Pebble)

Sedimentary Rock (Quartz Sandstone / Arenite)

Granite

Intrusive Igneous Rock

Tumbled polymetallic mineral specimen, likely chalcopyrite-bearing ore

Probable chalcopyrite (CuFeS₂) with quartz and iron-oxide minerals; exact identification is uncertain from the photograph

Tumbled pegmatitic granite

Coarse-grained granite/pegmatite, chiefly quartz, feldspar, and biotite or amphibole

Quartz-rich feldspathic rock, likely granite or granitic pegmatite

Granite/pegmatite composed mainly of quartz (SiO₂) and feldspar, with minor mica or iron-oxide staining

Green copper-mineral specimen, likely chrysocolla or copper-bearing serpentine

Tentatively chrysocolla (hydrated copper phyllosilicate, approximately (Cu,Al)2H2Si2O5(OH)4·nH2O); exact identification requires testing