Mixed (Igneous, Sedimentary, Metamorphic, And Minerals)

Banded Gneiss

Gneiss

Pegmatite

Granitic Pegmatite

Alluvial stream gravel (mixed rock specimens)

Polymictic fluvial deposit; likely mixtures of quartzite, sandstone, shale, chert, basalt, and granite-derived minerals

Weathered quartz-rich rock, possibly granite or granitic pegmatite

Indeterminate quartz–feldspar aggregate; likely granite/pegmatite

Small brown mineral fragment

Unidentified; the image lacks enough detail for a reliable species-level identification

Diorite

Intermediate Phaneritic Igneous Rock

Clear quartz crystal

Quartz (SiO₂), likely a small rough or naturally fractured crystal

Magnetite (Small Granule)

Magnetite (Fe3O4)

Magnetite-rich iron ore

Magnetite (Fe₃O₄), possibly mixed with hematite or metallic sulfides

Mixed metamorphic rock fragments, likely garnet-bearing schist and quartzite

Quartz–feldspar–mica schist/quartzite; red grains may be almandine garnet

Pyrite-bearing sulfide specimen

Pyrite (FeS₂), possibly with chalcopyrite (CuFeS₂) and/or marcasite

Magnetite / Iron Ore

Magnetite (Fe3O4)

Conglomerate

Conglomerate (clastic sedimentary rock)

Gneiss

Gneiss (High-grade metamorphic rock)

Iron-rich concretion or weathered ironstone

Goethite–hematite-rich limonite (FeO(OH)·nH₂O / Fe₂O₃)

Magnetite

Magnetite (Fe3O4)

Conglomerate

Conglomerate (clastic sedimentary rock)

Polished granite cobble

Granite, typically quartz–feldspar–biotite granite

Quartz

Silicon Dioxide (SiO2)

Mixed river pebbles (gravel)

Polymictic alluvial gravel; diverse clasts, likely including quartz, feldspar-rich granitoids, and metamorphic rocks

Quartz

Silicon Dioxide (SiO2)

Quartz Crystal Rock

Silicon Dioxide (SiO2)

Mica (Muscovite or Biotite)

Sheet silicate mineral group (e.g., KAl2(AlSi3O10)(F,OH)2)

Quartz-rich rock, possibly iron-stained quartz or quartzite

Quartz (SiO₂), likely with iron-oxide inclusions; exact identification requires testing

Mixed polished/tumbled stones; likely blue calcite, red carnelian, and gray/blue quartz or agate

Probable calcite (CaCO₃), chalcedony/quartz (SiO₂), and iron-colored chalcedony

Specular Hematite

Hematite (Fe2O3)

Gneiss

Gneiss

Conglomeratic gravel / lithified alluvial deposit

Polymictic conglomerate or pebble-rich sandstone (likely weakly cemented)

Polished ruby-in-fuchsite (tentative)

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

Polished mixed rock, likely orbicular/epidote-bearing granite or basalt

Uncertain; probable quartz–feldspar–amphibole/epidote aggregate

Magnetite (Lodestone)

Magnetite (Fe3O4)

Banded Gneiss Pebble

Gneiss (Metamorphic Rock)

Quartz Pebble

Silicon Dioxide (SiO2)

Quartz Crystal

Silicon Dioxide (SiO2)

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Quartz

SiO2 (Silicon Dioxide)

Gneiss

Gneiss (foliated metamorphic rock)

Limonite (Ironstone Concretion)

Limonite (Hydrous Ferric Oxides mixed with Goethite)

Tumbled quartz-rich pebble

Microcrystalline quartz (SiO₂), possibly milky quartz or chalcedony

Mixed River Pebbles and Jasper

Siliciclastic sediment and microcrystalline quartz

Possibly iron-stained quartz or chalcedony

Quartz/chalcedony (SiO₂), identification uncertain from the image

Magnetite with Quartz

Magnetite (Fe3O4)