Mineralogical Specimen

Granite (Fine-grained)

Phaneritic Felsic Igneous Rock

Granite

Granite (Felsic Plutonic Rock)

Granite

Phaneritic Plutonic Igneous Rock (Granite)

Granite

Phaneritic Igneous Rock (composed of quartz, alkali feldspar, and plagioclase)

Granite

Felsic Intrusive Igneous Rock

Chrysoprase- or serpentine-bearing quartz vein with pyrite

Quartz (SiO₂) with iron sulfide, chiefly pyrite (FeS₂), in altered Mg-rich rock; green material may be serpentine or nickel-bearing chalcedony

Hag Stone

Sandstone or Limestone with Solution Holes (Bioturbation/Erosion)

Polished green serpentinite

Serpentinite, chiefly serpentine-group minerals (antigorite/lizardite/chrysotile), commonly with magnetite and minor carbonate

Likely polished leopard-skin jasper or brecciated jasper

Jasper, an opaque microcrystalline variety of quartz (SiO₂), with iron-oxide and other mineral inclusions; exact variety cannot be confirmed from the image alone

Tumbled dark green stone, likely serpentine

Serpentinite; chiefly serpentine-group minerals (Mg₃Si₂O₅(OH)₄)

Graphite Schist

C (Carbonaceous Schist)

Polished orbicular jasper (likely kambaba or ocean jasper)

Silicified microcrystalline quartz/chalcedony with iron-rich inclusions; mainly SiO₂

Onyx (Calcite Onyx / Mexican Onyx)

Calcium Carbonate (CaCO3)

Tumbled green aventurine (probable)

Quartz, SiO₂, with fuchsite mica inclusions

Limestone or Sandstone Cobble

Sedimentary rock (Calcium carbonate or Quartz based)

Rhyolite

Extrusive Felsic Igneous Rock

River Pebbles (Stream-rounded rocks)

Fluvial Detritus (varied mineralogy)

Yellow chalcedony (likely dyed or heat-treated)

Microcrystalline quartz, SiO₂ (chalcedony)

Polished bumblebee jasper (likely)

Calcite–sulfur-rich volcanic breccia, commonly sold as “bumblebee jasper”

Small rounded pebble

Indeterminate lithic clast; likely weathered quartzite, sandstone, or chert

Tumbled dalmatian jasper (likely)

Microcrystalline quartz/chalcedony with black amphibole or aegirine inclusions; commonly sold as “dalmatian jasper”

Tumbled orange chalcedony and a gray stone disk

Chalcedony (microcrystalline quartz, SiO₂); disk likely fine-grained sandstone or slate

Chalcopyrite

Copper Iron Sulfide (CuFeS2)

Polished dark-blue cabochon, possibly blue sodalite

Undetermined; blue sodalite is a possible identification (Na₈Al₆Si₆O₂₄Cl₂)

Small rounded yellow pebble, likely quartz-rich rock

Indeterminate from image; possibly iron-stained quartz or chert

Painted Garden Rock

Coated Siltstone or Mudstone

Tumbled chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert

Granite (Alkali-feldspar Granite)

Felsic Plutonic Rock (Primary minerals: Quartz SiO2, Orthoclase KAlSi3O8, Plagioclase (Na,Ca)AlSi3O8)

Pink Granite

Granite (Phaneritic intrusive igneous rock)

Granite (with Orthoclase and Quartz)

Phaneritic Felsic Igneous Rock (KAlSi3O8 + SiO2)

Granite

Granite (Plutonic Igneous Rock)

Granite

Granite (composed primarily of Quartz, Alkali Feldspar, and Plagioclase)

Granite

Granite (Alkali-feldspar, Quartz, and Plagioclase composition)

Schist (likely Mica Schist)

Mica Schist

Weathered greenish metamorphic rock, possibly serpentinite

Serpentinite, commonly dominated by antigorite/lizardite Mg₃Si₂O₅(OH)₄; identification is uncertain from the photograph

Blue-gray tumbled stone, likely sodalite

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; identification is tentative from the photograph

Polished ruby-in-zoisite (anyolite), likely

Ruby-bearing zoisite: zoisite Ca₂Al₃(SiO₄)₃(OH), with corundum Al₂O₃ and commonly amphibole

Dalmatian jasper

Orbicular microcrystalline quartz rock, commonly rhyolitic or volcanic-feldspar matrix with black arfvedsonite/alkali-amphibole inclusions

Scoria (vesicular volcanic rock)

Basaltic to andesitic scoria; chiefly plagioclase, pyroxene, and volcanic glass

Tumbled brown chert or flint

Microcrystalline quartz (SiO₂), commonly with chalcedony

Quartz Pebble

Silicon Dioxide (SiO2)

Banded Gneiss (with Quartz Vein)

Gneiss (Metamorphic rock of varying mineralogy)