Sedimentary And Igneous (Mixed)

Garnet (Red Garnet)

Garnet Group. The red varieties seen in jewelry are typically Almandine (Fe3Al2(SiO4)3), Pyrope (Mg3Al2(SiO4)3), or a mix of the two (pyrope-almandine series).

Quartz-bearing metamorphic rock, likely garnet-mica schist

Quartz–mica schist with probable garnet and iron-oxide minerals

Rounded gray stone, likely quartz-rich granitic rock

Probable granite or granitic gneiss; mainly quartz, feldspar, and mica

River Stones (Basalt and Sedimentary Rock)

Basalt (dark specimen) and Siltstone/Mudstone (reddish specimen)

Granodiorite

Granodiorite (Intermediate intrusive igneous rock)

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

River Stone (likely Andesite or Siltstone)

Intermediate Volcanic Rock / Fine-grained Sedimentary Rock

Yellow Quartz Pebble (Citrine or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Gneiss

Gneiss (quartz-feldspar-biotite gneiss)

Banded Agate (specifically Botryoidal/Orbicular Agate)

Silicon Dioxide (SiO2)

Pyrite (Fool's Gold)

Iron Disulfide (FeS2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz (Milky Quartz)

Quartz (SiO2 - Silicon Dioxide)

Green Fluorite

Calcium Fluoride (CaF2)

Milky Quartz

Crystalline Silicon Dioxide (SiO2)

Smoky Quartz with Chert

Silicon Dioxide (SiO2)

Fluorite

Calcium Fluoride (CaF2)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Banded Gneiss

Gneiss (Metamorphic Rock)

Granitic Gneiss

Gneiss (high-grade metamorphic rock primarily of quartz, feldspar, and mica)

Likely biotite-bearing metamorphic rock (schist or gneiss)

Mica schist/gneiss; chiefly quartz, feldspar, and biotite mica

Quartz (Milky/Smoky variety on matrix)

Silicon Dioxide (SiO2)

White Quartz

Quartz (SiO2)

Quartz (various varieties)

SiO₂ (Silicon Dioxide)

Quartz (Pebble)

Quartz (SiO₂)

Micaceous Rock (likely Muscovite Schist/Gneiss or a Muscovite-rich Specimen)

Predominantly Muscovite (KAl2(AlSi3O10)(F,OH)2), often found in rocks like Muscovite Schist or Muscovite Gneiss.

Black Beach Pebble (Basalt / Slate Pebble)

Rounded Fine-Grained Clastic / Igneous Rock Pebble

Likely hematite-rich ironstone or metallic mineral fragment

Hematite (Fe₂O₃), possibly with magnetite (Fe₃O₄) or metallic iron

Gneiss (specifically Biotite Gneiss)

Gneiss (high-grade metamorphic rock primarily composed of Silicates)

Agate Geode

Chalcedony (SiO2 - Silicon Dioxide)

Magnetite / Iron-Rich Concretion

Magnetite (Fe3O4) or Bog Iron Limonite

Graphite

Graphite (C)

Greenschist

Greenschist (composed mainly of chlorite, epidote, actinolite, and albite)

Gneiss (specifically a weathered or stream-worn specimen)

Gneiss (Foliated Metamorphic Rock)

Quartz Geode Fragment

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Banded Gneiss

Gneiss (Metamorphic high-grade rock)

Red Jasper (Opaque Chalcedony)

Silicon Dioxide (SiO2) with Hematite (Fe2O3) inclusions

Almandine Garnet

Iron aluminum silicate (Fe3Al2(SiO4)3)

Gneiss

Gneiss (High-grade regional metamorphic rock)

Quartz

Quartz (SiO2, Silicon Dioxide)