Industrial Byproduct (Anthropogenic Rock Like Material)

Rough Diamond

Diamond (Native Carbon, C)

Sandstone (specifically Banded Sandstone)

Clastic sedimentary rock (primarily SiO2)

Tiger’s-eye fragment

Chatoyant quartz, SiO₂, with pseudomorphic iron-oxide fibers

Mixed beach-stone and tumbled-glass collection

Predominantly uncertain rocks (likely basalt, granite, and quartz-bearing stones) with anthropogenic glass; one possible banded agate or jasper

Moss-covered Rock Fragment

Weathered Rock Fragment with Epilithic Growth

Red Sandstone

Ferruginous Sandstone (SiO2 dominated with Fe2O3)

Sandstone

Arenite (primary component SiO2)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Granitic Pegmatite (with Smoky Quartz and Mica)

Granitic Pegmatite (composed of SiO2, KAl2(AlSi3O10)(OH)2, and (K,Na)(AlSi3O8))

Rounded gray pebble, likely basalt or andesite

Fine-grained mafic to intermediate volcanic rock; commonly plagioclase with pyroxene and/or olivine

Sandstone (with Iron Staining)

Clastic sedimentary rock (SiO2 with Fe2O3 oxides)

Quartz Geode

Silicon Dioxide (SiO2)

Serpentine / Antigorite

Mg3Si2O5(OH)4 (Serpentine Group)

Rounded gray pebble, likely quartz-rich stone

Indeterminate; possibly quartzite or a weathered granitic pebble

Limestone

Sedimentary Calcium Carbonate (CaCO3)

Pink Granite

Phaneritic Plutonic Igneous Rock (high K-feldspar)

Chert / Yellow Jasper

Silicon Dioxide (SiO2)

Small weathered fossil or mineral fragment

Indeterminate; possibly fossilized shell, bone, or a pale carbonate mineral

Basalt

Aphanitic Mafic Igneous Rock

Basalt with Peridotite Inclusion

Mafic Volcanic Rock (Extrusive Igneous) with Ultramafic Xenolith

Quartz Pebble

Silicon Dioxide (SiO2)

Fossilized bivalve shell in limestone

Calcitic fossil shell; likely an oyster or other rudist/bivalve (Bivalvia), preserved in carbonate rock

Limestone

Calcium Carbonate (CaCO3)

Iron-stained chalcedony or jasper

Microcrystalline quartz (SiO₂), likely ferruginous jasper/chalcedony

Iron-stained quartz vein rock

Quartz-rich rock with iron-oxide/hydroxide coatings (hematite/goethite); exact host rock undetermined

Chert (Nodule)

Chert (Silica, SiO2)

Ceramic or Polished Stone Heart (Anthropogenic Material)

Glazed Ceramic (Silicon Dioxide based coating on Alumina Silicate body) or Polished Limestone/Marble (Calcium Carbonate, CaCO3)

Unidentified rock fragments

Indeterminate; likely a weathered, iron-stained silicate rock

Quartzite

SiO2 (Metamorphosed Sandstone)

Weathered quartz-rich rock or fossil fragment

Indeterminate; likely quartz-bearing sandstone or siliceous fossil material

Muscovite Mica Schist

Metamorphic Rock (Muscovite-Biotite Schist)

Likely sandstone or weathered quartz-rich rock fragment

Quartz-rich sandstone; exact identification is uncertain from the photograph

Basalt

Basalt (Mafic volcanic rock)

Sandstone (Banded)

Clastic Sedimentary Rock (primarily SiO2 with Iron Oxide staining)

Peridotite (Olivine Rock)

Peridotite (composed largely of olivine, (Mg, Fe)2SiO4)

White Topaz

Aluminum Silicate Fluoride Hydroxide; Al2SiO4(F,OH)2

Granitic Pegmatite

Granite (with coarse-grained Quartz, Feldspar, and Mica components)

Iron-rich sandstone concretion

Ferruginous sandstone, cemented chiefly by iron oxides (such as goethite and hematite)

Diamond (in Matrix)

Carbon (C)

Polished blue sodalite (probable)

Sodalite, Na₈(Al₆Si₆O₂₄)Cl₂; possibly blue-dyed chalcedony or lapis lazuli

Quartz vein in host rock

Milky quartz (SiO₂) with likely metamorphic country rock, possibly gneiss or schist

Quartzite

Quartzite (SiO2)