Sedimentary And Igneous (Mixed)

Gneiss (Granitic Gneiss)

Gneiss (from German Gneis, related to 'spark')

Pyrite

Iron Disulfide (FeS2)

Hematite

Hematite (Fe2O3)

Fluorite (Rainbow Fluorite Point)

Calcium Fluoride (CaF2)

Green Fluorite (Beaded)

Fluorite (Calcium Fluoride, CaF2)

Banded Gneiss

Gneiss (Metamorphic Rock)

Hematite

Iron(III) oxide (Fe2O3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Mica Schist (with Golden/Biotite inclusions)

K(Mg,Fe)3AlSi3O10(F,OH)2 (Biotite), KAl2(AlSi3O10)(F,OH)2 (Muscovite)

Quartz Pebble

Silicon dioxide (SiO2)

Quartz Pebble

Crystalline Silicon Dioxide (SiO2)

Quartz Pebble

Crystalline Silica (SiO2)

Sandstone (Arkose)

Arkose Sandstone (SiO2 with KAlSi3O8)

Granite (possibly granitic gneiss)

Felsic plutonic rock dominated by quartz, K-feldspar, plagioclase, biotite and/or hornblende

Basalt River Pebble

Basalt

Labradorite (tumbled)

Labradorite (a plagioclase feldspar mineral between anorthite and albite; chemical formula: (Ca,Na)(Si,Al)4O8)

Vein-filled Porphyry or Brecciated Jasper Pebble

Brecciated volcanic rock with quartz/calcite veins

Vesicular Basalt with Epidote/Amygdaloidal Basalt

Amygdaloidal Basalt (Mg, Fe)2SiO4 + Ca2(Al, Fe)3(SiO4)3(OH)

Orbicular Rhyolite (Rainforest Jasper)

Rhyolite containing Spherulites (SiO2 with impurities)

Greenstone (Epidosite / Chlorite Schist)

Metabasalt (often contains Epidote Ca2Al2(Fe3+,Al)(SiO4)(Si2O7)O(OH) or Chlorite)

Quartz

SiO₂ (Silicon Dioxide)

Quartz Pebble

Silicon Dioxide (SiO2)

Greenstone / Greenschist

Greenschist facies metamorphic rock

Quartz River Pebbles

Silicon Dioxide (SiO2)

Leopard Skin Jasper

Silicon Dioxide (SiO2) with various inclusions

Milky quartz fragment

Quartz (silicon dioxide, SiO₂)

Yellow Quartz (Citrine/Yellow Jasper mix)

Silicon Dioxide (SiO2)

Green Moss Agate

Silicon Dioxide with inclusions (SiO2 + Mn/Fe)

Quartz pebble

Silicon dioxide (SiO2)

Yellow Jasper

Silicon Dioxide (SiO2)

Orange Quartz with Hematite inclusions

Quartz (SiO2) with Hematite (Fe2O3) inclusions

Black Beach Pebble (Basalt/Greywacke Pebble)

Aphanitic Mafic Igneous Rock / Basalt

K2 Jasper (K2 Granite)

Granite with Azurite inclusions (SiO2 + Cu3(CO3)2(OH)2)

Quartz

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Common Quartz Pebble

Silicon dioxide (SiO2) rock fragment

Chert on Volcanic Host Rock

Sedimentary Chert (SiO2) within Basalt or Andesite

Quartz Pebble

Crystalline Silica (SiO2)

Granitic Sand

Detrital sediment (predominantly Quartz, Feldspar, and Mica)

Weathered volcanic rock, likely vesicular basalt or scoria

Basaltic volcanic rock; predominantly plagioclase, pyroxene, and possibly olivine with iron-oxide weathering

Granite and Igneous Rock Collection

Intrusive igneous rock / Granitoid

Quartz-rich sandstone or granitic fragment

Likely quartz–feldspar sandstone; exact identification is uncertain from the photograph