Mineral, Often A Rock Given Its Aggregate Nature

Yellow Jade (often Serpentine or Dolomite)

Primarily Serpentine (Mg3Si2O5(OH)4) or Dolomite (CaMg(CO3)2), though the term 'yellow jade' is also sometimes applied to varieties of true nephrite or jadeite.

Sandstone or Quartzite with algae

Unknown specific, largely SiO2 with biological growth

White Topaz (faceted)

Aluminum silicate fluoride hydroxide (Al2SiO4(F, OH)2)

Siltstone with Quartz Vein

Siltstone (composed of Quartz and Clay minerals) with a hydrothermal Quartz vein (SiO2)

Gabbro

Gabbro (Mafic Plutonic Rock)

Pumice (likely)

Pumice (extrusive igneous rock)

Unidentifiable Specimen

Undetermined

Basalt

Extrusive Igneous Rock

Rough Topaz

Aluminum silicate fluoride hydroxide (Al2SiO4(F,OH)2)

Pebble (likely Quartz or Chert)

SiO₂ (Silicon Dioxide) - referring to the likely main mineral composition, Quartz. If it's chert, the scientific name remains SiO₂ with a microcrystalline structure.

Banded Agate

Chalcedony (SiO2) with impurities

Muscovite Mica

Muscovite (Potassium Mica) KAl2(AlSi3O10)(OH)2

Pebble (likely Sandstone or Granitic Pebble)

Clastic Sediment (or specific rock type, e.g., Arenite, Granitoid Pebble)

Milky Quartz

Quartz (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 (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Sandstone (Quartzite-rich)

Clastic sedimentary rock (SiO2 primarily)

Quartz (River Pebble)

Silicon Dioxide (SiO2)

Granite

Phaneritic plutonic rock (SiO2 rich)

Chert / Jasper

Microcrystalline Quartz (SiO2)

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Basalt

Extrusive Igneous Rock

Red Jasper

Jasper (a variety of Chalcedony, SiO₂ with iron oxide inclusions)

Jasper

Microcrystalline Quartz (SiO2)

Limestone ( weathered ) / Chert Nodular Rock

Sedimentary rock (primarily Calcium Carbonate, CaCO3, with Microcrystalline Quartz, SiO2)

Quartz (chalcedony variety) or Limestone with Quartz Veins

SiO2 (for Quartz/Chalcedony); CaCO3 (for Limestone)

Chert

Microcrystalline or cryptocrystalline quartz

Granite Pebble

Granite (Felsic Plutonic Rock)

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Carved Mottled Greenish-Yellow Crystal/Glass Object

Unknown; possibly a form of quartz (chalcedony/jadeite/nephrite) or glass/resin.

Dyed Agate

SiO2 (Silicon Dioxide)

Purple Chalcedony

Silicon Dioxide (SiO2)

Graywacke

Lithic Sandstone (Graywacke)

White Topaz

Al2SiO4(F,OH)2 (Aluminium Silicate Fluoride Hydroxide)

Mixed mineral and shell specimen assortment

Primarily unidentified quartz-/feldspar-like pebbles with possible dark basalt or iron-rich fragments; white pieces may include shell or calcite

River Rock (Mossy)

Stream-rounded Clast (likely Siltstone or Sandstone with bryophytes)

Unidentified Rock Fragment

Unknown

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Orange Calcite

Calcite (Calcium Carbonate, CaCO3)

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

Larimar

Pectolite (Sodium Calcium Silicate Hydroxide) - (NaCa2(Si3O8)(OH))

Jasper with Quartz

Silicon dioxide (SiO2)