Mineral

Morganite and Aquamarine (Beryl) Bracelet

Beryllium aluminum silicate, Be3Al2(SiO3)6

Bicolor Quartz Tumble

Silicon Dioxide (SiO2)

Granite (likely polished or weathered granite)

Granite, a coarse-grained intrusive felsic rock composed mainly of quartz, feldspar, and mica

Turquoise and Hematite

Turquoise (CuAl6(PO4)4(OH)8·4H2O) and Hematite (Fe2O3)

Likely granite or granitic gneiss

Granite: coarse-grained felsic intrusive rock, typically quartz, potassium feldspar, plagioclase, and mica; the image alone cannot distinguish it confidently from gneiss.

Banded gneiss

Foliated gneiss, likely quartz–feldspar–biotite gneiss

Likely diorite (small hand specimen)

Diorite; chiefly plagioclase feldspar and hornblende, often with biotite

Fossil shark tooth

Shark tooth; species cannot be determined from the image

Granite pebble

Granite, a coarse-grained quartz–feldspar rock with dark mica or amphibole

Likely serpentinite (greenstone pebble)

Serpentinite, composed mainly of serpentine-group minerals (e.g., lizardite, chrysotile, or antigorite)

Biotite gneiss (probable)

Foliated quartz–feldspar–mica gneiss; commonly containing biotite mica, quartz, and plagioclase/alkali feldspar

Copper Ore

Mixed copper sulfides/oxides in gangue matrix

Gravel and Pebbles

Unconsolidated rock fragments / detrital sediment

Fossilized Shark Tooth

Chondrichthyes (Class)

Fossil Shark Tooth

Carcharodon or Carcharias fossil (Vertebrate Fossil)

Epidote

Calcium aluminum iron silicate (Ca2(Al, Fe)3(SiO4)3(OH))

Basalt with Vesicular/Amygdaloidal Alteration

Extrusive Igneous Rock (Mafic)

Basalt with Amygdule

Aphanitic Mafic Volcanic Rock (Basalt) with Zeolite/Quartz Infill

Epidote

Epidote (Ca2(Al2,Fe3+)(SiO4)(Si2O7)O(OH))

Weathered granite pebble

Granite, a coarse-grained felsic intrusive igneous rock

Polished bumblebee jasper bead

Bumblebee jasper (trade name); chiefly calcite, aragonite, and pyrite, with variable realgar/orpiment and other minerals

Green Fluorite

Calcium Fluoride (CaF2)

Gneiss (foliated metamorphic rock)

Gneiss

Green copper-bearing rock, likely chrysocolla-bearing quartz or host rock

Chrysocolla (Cu₂H₂Si₂O₅(OH)₄·nH₂O), possibly mixed with quartz and copper oxides

Pale green mica-rich rock (possibly chlorite schist)

Likely chlorite schist; identification is uncertain from the photograph

Granite

Intrusive Felsic Igneous Rock

Banded Gneiss

Gneiss

Peacock Ore

Bornite (Cu5FeS4) or iridescent Chalcopyrite (CuFeS2)

Small rough mineral or rock fragment (not identifiable from the image)

Undetermined; the specimen is too small and lacks diagnostic visible features for a reliable identification

Small rough mineral grain, possibly olivine (peridot)

Olivine-group silicate, commonly (Mg,Fe)₂SiO₄; identification is uncertain from the image

Unidentified gray mineral/rock fragment

Indeterminate from the photograph; possibly a quartz- or feldspar-bearing rock fragment

Tiny metallic-looking mineral or rock fragment

Unidentifiable from the image; possibly a small metallic mineral grain

Possible green glassy mineral pebble

Undetermined; possibly green aventurine (quartz) or another green mineral

Weathered mica schist (tentative)

Mica schist, likely muscovite–biotite schist with quartz and feldspar

Weathered granite or granitic gneiss

Granite/granitic gneiss, composed mainly of quartz, feldspar, and mica

Polished agate geode slice

Microcrystalline quartz (chalcedony), SiO₂, with possible quartz-lined or calcite-filled cavity

Likely chlorite schist

Chlorite-rich schist; chiefly chlorite with possible quartz and mica

Silver Nuggets (Natural or Cast)

Native Silver (Ag)

Quartz Geode

Silicon Dioxide (SiO2) in Geodic Cavity

Proustite

Proustite (Ag3AsS3)

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Cobaltian Calcite

Cobalt-bearing Calcite (Ca,Co)CO3