Mixed

Conglomerate

Sedimentary Conglomerate

Lunar Meteorite

Lunar Feldspathic Breccia

Epidote (Unakite variety)

Epidosite (Metasomatic rock containing Ca2(Al,Fe)3(SiO4)3(OH))

Pink Granite

Phaneritic Quartz-Feldspar Plutonic Rock

Conglomerate

Conglomerate (clastic sedimentary rock)

Small polished gemstone chips, likely mixed quartz varieties

Quartz (SiO₂), possibly including smoky quartz and other varieties; exact identification is uncertain from the image

Weathered rounded cobble

Indeterminate lithology; likely weathered sandstone or volcanic rock

Ferruginous Slag (Iron Smelting Byproduct)

Fused Silicate Scoria (Amorphous mixture of FeO, SiO2, and CaO)

Concrete

Anthropogenic Sedimentary Rock (Hydrated Calcium Silicate)

Epidote in Matrix (likely Amphibolite or Gneiss)

Epidote (Ca2(Al2,Fe)(SiO4)(Si2O7)O(OH)) in Metamorphic Matrix

Polished brecciated jasper bracelet

Jasper, microcrystalline quartz (SiO₂), commonly with hematite and iron-oxide inclusions

Chrysocolla-bearing copper ore

Chrysocolla (hydrated copper aluminosilicate), commonly with malachite and quartz

Conglomeratic breccia (polymict volcanic breccia)

Polymict volcaniclastic breccia; clasts likely basaltic/andesitic rock in a dark matrix

Chalcedony (likely carnelian or jasper)

Microcrystalline quartz, SiO₂; iron-bearing varieties produce red-orange colors

Uncertain small mineral specimen, possibly fluorite or quartz-bearing rock

Indeterminate; pale green/purple material may include fluorite (CaF₂) or quartz (SiO₂)

Polymictic conglomerate

Lithified polymictic conglomerate; clasts likely quartzite, granite, and volcanic rock in a dark matrix

Bauxite (Iron-stained Chert / Ironstone Aggregate)

Hydrous aluminum oxide mixture (mainly Gibbsite Al(OH)3, Boehmite γ-AlO(OH), and Goethite α-Fe3+O(OH))

Yellow Jasper

Silicon Dioxide (SiO2) - Microcrystalline Quartz

Polished ruby-in-fuchsite (tentative)

Fuchsite mica with corundum (ruby), commonly in quartzite or mica schist

Unakite

Altered Granite (Epidotized Granite)

Devil's Toenail (Fossil Oyster)

Gryphaea arcuata (Calcium Carbonate, CaCO3)

Eudialyte

Eudialyte (Na4(Ca,Ce)2(Fe2+,Mn,Y)ZrSi8O22(OH,Cl)2)

Likely quartz-rich metamorphic pebble

Possibly quartzite; exact identification is uncertain from the photo

Quartz-bearing feldspar pegmatite (likely with mica/tourmaline)

Granitic pegmatite; chiefly quartz (SiO₂) and feldspar, with dark mica or tourmaline

Granite pebble

Granite; primarily quartz, alkali feldspar, plagioclase, and dark mica/amphibole

Polished/rounded granite cobble

Granite, chiefly quartz (SiO₂), feldspar, and mica/amphibole

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Lapis Lazuli (Low-grade)

Lapis Lazuli (Aggregate of Lazurite, Calcite, and Pyrite)

Polished granite pebble

Granite; chiefly quartz, feldspar, and mica/amphibole

Conglomeratic concrete or asphalt aggregate surface with dark bituminous chunks

Polymictic gravel aggregate; dark pieces likely bitumen/asphalt, not a natural rock

Diorite (River Rock/Cobble)

Intermediate Plutonic Igneous Rock (Diorite)

Crushed Stone (Gravel/Aggregates)

Crushed rock aggregate (varied composition including Granite, Limestone, and Quartz)

Pink Granite

Granite (Phaneritic Acidic Igneous Rock)

Quartz-rich pegmatite (likely rose/iron-stained quartz)

Quartz, SiO₂, in a coarse granitic pegmatite matrix; possibly with feldspar and mica

Concrete Fragment

Hardened Portland Cement Composite

Asphalt / Bituminous Aggregate

Bituminous mixture (Hydrocarbon-based sediment)

Quartz (Engineered Quartz Surface)

Silicon Dioxide (SiO2) based composite

Pyrite in Matrix (Healers Gold / Pyrite Egg)

Iron Disulfide (FeS2) with Magnetite/Hematite matrix

Polished sodalite-bearing rock

Likely sodalite in a feldspar-rich host; exact rock identification is uncertain from the image

Quartz-rich rock fragment

Likely milky quartz with feldspar and possible mica; exact rock type is indeterminate from the image

Granite or Granitoid River Rock

Granite

Chrysocolla Cuprite

Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O (Chrysocolla) and Cu2O (Cuprite)