Sedimentary Or Igneous Fragment

Quartz (Microcrystalline/Gravel)

Silicon Dioxide (SiO2)

Quartz Geode fragment

Crystalline Silicon Dioxide (SiO2)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Small brown-gray rock fragment

Unidentified fine-grained rock; exact lithology cannot be determined from the image

Quartz (Milky/Clear variety)

Silicon Dioxide (SiO2)

Quartz fragment

Quartz (silicon dioxide, SiO₂), likely milky or smoky quartz

Mica-rich schist (probable)

Foliated quartz–mica schist; likely containing quartz, muscovite and/or biotite

Garnet Gneiss

Gneiss containing Almandine Garnet

Small dark mineral fragment, possibly mica or a metallic sulfide

Unidentified from image; possible biotite mica or iron sulfide (pyrite-group)

Small translucent brown pebble, likely quartz or chalcedony

Quartz (SiO₂), possibly microcrystalline quartz (chalcedony)

Quartz Chip

Silicon Dioxide (SiO2)

Quartz-rich weathered rock, possibly quartzite

Quartzite (mostly SiO₂); exact identification is uncertain from the image

Quartz (Small Fragment)

Silicon Dioxide (SiO2)

Possibly citrine (yellow quartz)

Quartz, SiO₂; variety uncertain from the image

Unidentifiable Rock Fragment

Quartz Crystal

Silicon Dioxide (SiO2)

Quartz

SiO2 (Silicon Dioxide)

Fossiliferous limestone fragment

Calcitic limestone; mainly calcium carbonate (CaCO₃), possibly with shell or coral debris

Weathered iron-rich rock, possibly limonite-bearing basalt or ironstone

Uncertain; likely Fe-oxide/hydroxide–stained mafic rock (hematite Fe₂O₃, goethite FeO(OH), and silicates)

Rough amber-colored quartz or calcite fragment

Likely quartz (SiO₂) or calcite (CaCO₃); exact identification requires testing

Amber (likely a small rough amber piece)

Fossilized plant resin; amber is an organic mineraloid, not a crystalline mineral

Mica-rich Schist fragment

Mica Schist

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Quartz Geode

Silicon Dioxide (SiO2)

Likely rough quartz fragment

Quartz (SiO₂), possibly iron-stained or included quartz

Muscovite-rich schist (mica schist)

Mica schist, composed chiefly of muscovite (KAl₂(AlSi₃O₁₀)(OH)₂), with possible quartz and feldspar

Quartz fragment

Quartz (silicon dioxide, SiO₂)

Mica-rich metamorphic rock, likely biotite schist

Biotite–quartz schist; probable composition of quartz, biotite, feldspar, and minor sulfide or iron-oxide minerals

Quartz Pebble

Silicon Dioxide (SiO2)

Chalcedony (Smoky Quartz or Agate nodule fragment)

Silicon Dioxide (SiO2)

Weathered iron-rich rock, possibly basalt or ironstone

Uncertain; likely weathered basalt (plagioclase–pyroxene) or hematite/goethite-bearing ironstone

Gray quartz pebble or fragment

Quartz (SiO₂)

Conical fossil shell or shell fragment

Likely a gastropod shell fragment; exact taxon indeterminate from the image

Metallic sulfide mineral fragment, likely galena

Galena (lead sulfide, PbS), tentative identification

Likely iron-stained quartz or quartzite fragment

Quartz (SiO₂), possibly quartzite; exact identification is uncertain from the image

Likely clear quartz fragment

Quartz (SiO₂)

Quartz Crystal Fragment

Silicon Dioxide (SiO2)

Porous iron-rich rock or slag-like material

Unidentified; possibly limonite/goethite-rich ironstone

Mixed Pebbles and Shell Fragments

Polylithic sedimentary aggregate and biogenic calcium carbonate

Small pale mineral/rock fragment

Indeterminate; possibly weathered quartz, calcite, or light-colored limestone

Natural freshwater pearls

Pearl (nacreous calcium carbonate; chiefly aragonite, CaCO₃)

Mixed Mineral and Crystal Assortment

Various silicate and oxide minerals