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.

Pumice (likely)

Pumice (extrusive igneous rock)

Unidentifiable Specimen

Undetermined

Gabbro

Gabbro (Mafic Plutonic Rock)

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.

Pebble (likely Sandstone or Granitic Pebble)

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

Muscovite Mica

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

Quartz (likely Milky Quartz)

Quartz (SiO₂ - Silicon Dioxide)

Quartz (chalcedony variety) or Limestone with Quartz Veins

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

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)

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

Calcite

Chert / Jasper

Microcrystalline Quartz (SiO2)

Rough Quartz in Pegmatite Matrix

Quartz (Silicon Dioxide - SiO2) in Granitic Pegmatite

Red Jasper

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

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Larimar

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

Unidentified Rock Fragment

Unknown

Quartz (Rock Crystal) with minor impurities

Quartz (SiO2)

Carved Mottled Greenish-Yellow Crystal/Glass Object

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

Grey Agate (Tumbled)

Silicon Dioxide (SiO2)

Conglomerate

Conglomerate (a clastic sedimentary rock)

Gold (Elemental Metal)

Gold (Au)

Muscovite Mica

Muscovite (Potassium Aluminum Silicate Hydroxide Fluoride), KAl2(AlSi3O10)(OH,F)2

White Topaz

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

Biotite Mica

Biotite (K(Mg,Fe)3AlSi3O10(OH,F)2)

Greywhacke (River Pebble)

Graywacke (immature sandstone)

White Topaz

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

Red Jasper

Jasper (a cryptocrystalline variety of Quartz, SiO₂)

Unknown Organic Object (likely a berry or fruit)

Not applicable; this is not a geological specimen. If it were a cranberry, its scientific name would be Vaccinium macrocarpon; if a cherry, it would be Prunus avium or Prunus cerasus.

Iron Slag

Ferrous slag (primarily silicates and oxides of calcium, iron, and magnesium)

Specular Hematite (Specularite)

Iron(III) oxide (Fe2O3)

Scoria

Extrusive Basaltic Scoria

River Rock (River Cobbles)

Fluvial Conglomerate Clasts (primarily composed of various minerals such as Quartz, SiO2)

Banded Rock (likely Quartz-rich)

Uncertain, likely a Metamorphic Rock (e.g., Gneiss or Schist) with prominent Quartz and other minerals

Shale

Shale (clastic sedimentary rock)

Given the appearance, it's likely a fragment of an igneous or metamorphic rock composed of multiple minerals. Without specific diagnostic features, it's difficult to give a common name other than 'crystalline rock fragment'. If pressed to guess based on the granular, somewhat light and dark speckled appearance, it could be a fragment of granite or a related intrusive igneous rock.

As a rock fragment, it does not have a single scientific mineral name; rather, it's a piece of a rock which is a combination of minerals. If it were granite, its main mineral composition would be quartz (SiO2), feldspar (e.g., KAlSi3O8 - orthoclase, (Na,Ca)(Al,Si)4O8 - plagioclase), and mica (e.g., KAl2(AlSi3O10)(OH)2 - muscovite or K(Mg,Fe)3AlSi3O10(OH)2 - biotite), among others.

Jasper (Red Jasper)

Silicon Dioxide (SiO₂)

Basalt (Porphyritic)

Basalt (Mafic Extrusive Igneous Rock)

Basalt (with Porphyritic/Vesicular texture)

Extrusive mafic igneous rock

Milky Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Shale

Shale (Lutite)