Mineral In A Matrix (Likely Quartz Or Feldspar)

Quartz with Tourmaline and Iron Staining

Silicon Dioxide (SiO2) with Schorl (NaFe2+3Al6(Si6O18)(BO3)3(OH)3OH)

Pyrite-bearing quartz vein rock

Pyrite (FeS₂) in quartz, possibly with iron-oxide weathering products

Polished brecciated jasper

Jasper, microcrystalline quartz (SiO₂), with iron-oxide and pale silica-rich fragments

Gold Ore (Auriferous Quartz with Chalcopyrite/Pyrite)

Au (Native Gold) in Quartz (SiO2) with FeS2 (Pyrite) or CuFeS2 (Chalcopyrite)

Beryl (Aquamarine) in Matrix

Beryllium aluminum silicate (Be3Al2(SiO3)6)

Gneiss

High-grade metamorphic rock (Gneiss)

Biotite–hornblende granite (likely granodiorite)

Coarse crystalline plutonic rock composed mainly of quartz (SiO₂), feldspar, biotite mica, and amphibole

Sodalite (Sunset Sodalite)

Sodalite: Na8(Al6Si6O24)Cl2

Sandstone (likely Arkose)

Arenite (composed mainly of SiO2 with Feldspar)

Granite

Granite (composed mainly of quartz, alkali feldspar, and plagioclase)

Milky Quartz Pebble with Matrix

Quartz (Silicon Dioxide, SiO2)

Graphic Granite

Pegmatitic Granite (Quartz and Microcline KAlSi3O8)

Brown quartz-rich stone, possibly smoky quartz or quartzite

Quartz (SiO₂), potentially in a quartzite or silica-rich matrix

Weathered quartz-rich rock, possibly milky quartz or quartz-bearing granite

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

Small quartz-rich rock fragment (tentative)

Quartz, silicon dioxide (SiO₂), possibly in a feldspar-bearing granite fragment

Sandstone (likely Ferruginous)

Arenite (primarily SiO2 with Fe2O3 staining)

Graphic Granite

Graphic Granite (Granitic Pegmatite)

Sandstone (River Pebble)

Clastic Sedimentary Rock (primarily Quartz)

Milky Quartz with Matrix

Quartz (Silicon Dioxide, SiO2)

Dalmatian Stone

Dalmatian Jasper (Aplitic Perthite)

Graphic Granite

Graphic Granite (a variety of Pegmatite)

Weathered granite or granitic pegmatite cobble

Granite/granitic rock, composed mainly of quartz (SiO₂), feldspar, and minor biotite or other dark minerals; the reddish-brown areas may be iron-oxide staining or weathered accessory minerals

Granite

Intrusive Igneous Rock (Felsic)

Speckled rounded stone, likely granite or granitic gneiss

Granite/granitic gneiss; primarily quartz (SiO₂), feldspar, and dark mica or amphibole

Pink feldspar-bearing granite or pegmatitic rock

Granite/pegmatite, chiefly quartz (SiO₂), potassium feldspar (KAlSi₃O₈), plagioclase, and dark mica/amphibole; pink areas may be K-feldspar or garnet.

Quartz-bearing volcanic rock, likely vesicular basalt

Basalt with secondary quartz (SiO₂) and possible zeolite/chalcedony infill

Goldstone (Red)

Aventurine Glass

Rounded quartz-rich cobble, likely granite-derived stone

Granite or granitic gneiss, composed mainly of quartz, feldspar, and minor mica

Tumbled quartz-rich rock, likely milky quartz with feldspar

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

Small white mineral fragment

Indeterminate; possibly quartz, calcite, or feldspar

Weathered brown rock fragment

Indeterminate; possibly weathered granite, gneiss, or iron-stained quartz-rich rock

Milky quartz

Quartz (silicon dioxide, SiO₂)

Pink Granite

Plagioclase-Quartz-K-Feldspar Granite

Black-and-copper polished granite

Biotite granite, likely a commercial gabbro/granite variety

Granite

Granite (a felsic intrusive igneous rock)

Pyritic Sandstone

Clastic Sedimentary Rock (Pyrite-bearing Sandstone)

Polymictic breccia, possibly volcanic breccia

Polymictic clastic breccia; likely a matrix-supported breccia containing lithic fragments, quartz, feldspar, and dark mafic minerals

Porphyritic Basalt or Diabase

Porphyritic Igneous Rock

Weathered gray stone, likely granite or gneiss

Probable granitic rock; exact identification is uncertain from the image

Quartz-bearing granite or gneiss fragment

Granite/gneiss composed mainly of quartz (SiO₂), feldspar, and minor mica or ferromagnesian minerals

Porphyry (Basaltic / Andesitic Porphyry)

Porphyritic Basalt / Porphyritic Andesite

Granitic Pegmatite with Graphic Texture

Graphic Granite (alkali feldspar and quartz intergrowth)