Mineral In A Matrix (Likely Quartz Or Feldspar)

Crushed Granite and Quartz Gravel

Composite Igneous and Silicate Rock Aggregate

Gneiss with Quartz Vein

Metamorphic Gneiss

Sandstone with Quartz Vein

Arenite with Quartz (SiO2) protrusion

Weathered porphyritic volcanic rock (likely andesite or basalt)

Aphanitic to porphyritic andesite–basalt; composition commonly plagioclase, pyroxene, and minor iron oxides

Quartz Vein in Siltstone

SiO2 (Quartz) on clastic sedimentary matrix

Rhyolite or jasper-bearing volcanic rock

Rhyolite, likely altered and silicified; red coloration may come from hematite

Pegmatite with Black Tourmaline

Granitic Pegmatite with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

Porphyritic Basalt

Basalt (with plagioclase or k-feldspar phenocrysts)

Porphyritic Basalt or Andesite

Porphyritic Basalt / Andesite

Iron-stained quartz or quartz-rich rock

Quartz (SiO₂), possibly limonite/goethite-stained quartzite or breccia

Porphyry

Porphyritic Igneous Rock

Granite with Mafic Inclusions

Granite (Phaneritic igneous rock composed of Quartz, Feldspar, and Mica)

Sandstone (Pebble)

Arenite / Clastic Sedimentary Rock

Weathered porphyritic volcanic rock

Likely porphyritic andesite or dacite, with plagioclase phenocrysts in a fine-grained volcanic groundmass

Porphyritic Andesite/Basalt or Diorite River Rock

Porphyritic Igneous Rock

Weathered granite-like rock

Coarse-grained granitic rock, likely quartz–feldspar–mica aggregate

Weathered quartz-rich sandstone or granitic rock

Indeterminate; likely iron-stained quartz sandstone, possibly weathered granite

Likely quartz-bearing mineral aggregate

Quartz (SiO₂), possibly mixed with mica or feldspar

Granite with Epidote

Granite, containing quartz, feldspar, and epidote

Porphyritic Andesite

Andesite (Porphyritic texture)

Agate Jasper

Cryptocrystalline Quartz (SiO2) with impurities

Feldspar-rich Quartzite

Feldspathic Quartzite (Metamorphosed Sandstone)

Aquamarine on Feldspar Matrix

Beryl (Be3Al2Si6O18) with Potassium Feldspar (KAlSi3O8)

Graphic Granite

Graphic Granite (Granitic Pegmatite)

Dalmatian Jasper

Dalmatian Stone (a microcrystalline quartz and feldspar rock with arfvedsonite)

Banded gneiss

Gneiss, likely biotite–quartz–feldspar gneiss

Quartzite in Conglomerate

Clastic Sedimentary Rock with Silicon Dioxide (SiO2) inclusions

Graphic Granite

Graphic Granite (Quartz/Feldspar intergrowth)

Feldspar (Orthoclase/Microcline)

Potassium Feldspar (KAlSi3O8)

Basalt with Quartz/Calcite Inclusions

Mafic Volcanic Rock (Fe-Mg silicate rich)

Quartz-rich pegmatitic rock, possibly rose quartz with mica

Granitic pegmatite; predominantly quartz (SiO₂), with feldspar and mica

Porphyritic Basalt (with Granite inclusion)

Porphyritic Mafic Volcanic Rock

Basalt with Quartz Infill

Basalt (Mafic Extrusive Volcanic Rock)

Garden Quartz (Lodolite / Inclusion Quartz)

Quartz with inclusions (SiO2 with various mineral inclusions)

Pegmatitic granite (quartz–feldspar–mica rock)

Granitic pegmatite; mainly quartz (SiO₂), feldspars, and biotite/muscovite mica

Basalt with Jasper Veining

Basaltic Rock with Cryptocrystalline Quartz (SiO2)

Quartz-rich pegmatite or weathered feldspathic rock

Granite-family pegmatite; likely quartz (SiO₂) with feldspar and mica

Coarse-grained granite or granitic pegmatite

Granite; primarily quartz (SiO₂), feldspar, and mica/amphibole

Basalt with Quartz Vein

Basalt (SiO2 vein inclusion)

Quartz-veined Mudstone or Argillite

SiO2 (Quartz) in Siltstone/Mudstone matrix

Weathered granite

Granite; interlocking quartz–feldspar–mica aggregate

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite