Organic Material (Likely A Fruit Or Berry)

Unidentified coarse-grained rock fragments

Likely granite or granitic rock; exact identification is uncertain from the photograph

Chert (Flint)

Microcrystalline Quartz (SiO2)

Petrified Wood

Silicified Wood (Silicon Dioxide - SiO2)

Chert (Jasper/Flint variety)

Microcrystalline Quartz (SiO2)

Iron-rich breccia

Hematite–goethite-rich ferruginous breccia, likely a lateritic ironstone

Banded limestone or marble

Calcite-dominated carbonate rock; likely banded marble (CaCO₃)

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.

Green-and-white quartz-rich rock, likely chrysoprase or serpentine-bearing stone

Uncertain; possible chrysoprase (microcrystalline quartz, SiO₂) or serpentinite (magnesium silicate minerals)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

River Pebble (likely Quartzite or Basalt)

Quartzite (SiO2 as primary mineral)

Shale

Shale (fine-grained clastic sedimentary rock)

Polished brown chalcedony or jasper

Microcrystalline quartz (SiO₂), likely iron-stained chalcedony/jasper

Weathered fossiliferous limestone pebble

Calcitic limestone, predominantly CaCO₃ (likely containing fossil or bioclast fragments)

Polished hematite-rich ironstone

Hematite (Fe₂O₃), likely mixed with magnetite and iron-rich jasper

Pink quartz crystal, possibly rose quartz

Quartz (silicon dioxide, SiO₂), likely pink quartz/rose quartz

Milky quartz–rich rock

Quartz (SiO₂), likely massive milky quartz with minor dark inclusions

Turquoise cabochon jewelry

Turquoise, hydrated copper–aluminum phosphate: CuAl₆(PO₄)₄(OH)₈·4H₂O

Pebble or Cobble (likely composed of sandstone or conglomerate)

Clastic Sedimentary Rock (specific name like sandstone, conglomerate, or breccia would require microscopic analysis of clast size and angularity)

Banded Chert (Ironstone/Jasper)

Cryptocrystalline Quartz (SiO2) with Iron Oxides

Sandstone (likely Red/Brown Sandstone)

Arenite (SiO2 based)

Botryoidal chalcedony (gray agate/jasper-like silica)

Microcrystalline quartz, SiO₂; likely chalcedony with opaque quartz or jasper inclusions

Tumbled agate or chalcedony

Microcrystalline quartz (SiO₂), likely brown/orange chalcedony or agate

Polished jasper/chalcedony pebble

Microcrystalline quartz (SiO₂), likely brecciated or iron-stained jasper

Synthetic Resin / Plastic Figurine

Synthetic Polymer (Copolymer of Polyethylene or Resin)

Polished brecciated jasper

Jasper (microcrystalline quartz, SiO₂), likely iron-oxide-rich breccia

Coquina

Biogenic Limestone (Calcium Carbonate, CaCO3)

Red Jasper (beads)

SiO₂ (Silicon Dioxide)

Staurolite-bearing mica schist (probable)

Mica schist composed chiefly of muscovite/biotite, quartz, and likely staurolite or garnet

Crushed Limestone

Calcite-rich Sedimentary Rock (CaCO3)

Red Jasper (River Polished Quartzite)

Silicon Dioxide (SiO2) with Ferric Oxide (Fe2O3) impurities

Carbonaceous Chondrite (CV3 type)

Carbonaceous Chondrite (CV3 group)

Weathered iron-rich rock, possibly laterite or limonite-bearing sandstone

Laterite/limonite-rich material; commonly dominated by goethite (FeO(OH)) and hydrated iron oxides

Amber

Succinite (fossilized tree resin)

Milky quartz (quartz-rich rock fragment)

Quartz, silicon dioxide (SiO₂)

Coquina

Biogenic Limestone (Calcium Carbonate - CaCO3)

Bornite (“peacock ore”), likely weathered copper sulfide

Bornite, Cu₅FeS₄; possibly chalcopyrite, CuFeS₂, with iridescent tarnish

Chert or flint fragment

Microcrystalline quartz (SiO₂), likely iron-stained chert

Milky quartz (likely weathered quartz vein)

Quartz, silicon dioxide (SiO₂)

Blue slag glass or dyed glass-like industrial material

Amorphous silicate glass; likely copper-bearing blue slag, but possibly colored man-made glass

Banded chert or flint pebble

Microcrystalline quartz (SiO₂), likely chert with a pale weathered/altered zone

Orange chromium diopside (likely tumbled)

Diopside, CaMgSi₂O₆; orange color may reflect iron-rich composition or surface treatment/inclusion

Pearl

Pearl (Calcium Carbonate with organic conchiolin, CaCO3)