Mineral, Part Of A Rock

Amber

Succinite (Fossilized Resin)

Milky quartz (likely quartz crystal fragment)

Quartz, silicon dioxide (SiO₂)

Petrified Wood

Silicified Wood (SiO2)

Botryoidal Chalcedony (Desert Rose / Agate)

Silicon Dioxide (SiO₂)

Rugose Coral Fossil

Order Rugosa (Tetracorallia)

Hypersthene (or Enstatite/Ferrosilite)

Orthopyroxene series (Mg,Fe)SiO3 - specifically, historically hypersthene (intermediate member) now referred to as Enstatite (Mg-rich) or Ferrosilite (Fe-rich)

Quartz Pebble

Quartz (Silicon Dioxide, SiO2)

Rounded granite pebble

Granite, chiefly quartz, feldspar, and mica; possibly granodiorite

Rounded river pebble, likely weathered quartzite or sandstone

Quartzite (mostly SiO₂), possibly ferruginous sandstone

Iron-rich concretion or weathered ironstone

Limonite/goethite-rich ironstone; commonly hydrated iron oxides such as FeO(OH)·nH₂O

Amber

Fossilized Tree Resin (Generic formula: C10H16O)

Fossilized echinoid (sea urchin), likely a flint/chalk-associated test

Echinoid fossil; likely a regular echinoid such as Echinocidaris or related taxon, composed mainly of recrystallized calcite (CaCO₃)

Diabase (Greenstone Pebble)

Diabase or Dolerite

Ironstone (Limonitic Sandstone)

Ferruginous Sandstone (rich in Limonite: FeO(OH)·nH2O)

Fossiliferous Chert Nodule

SiO2 (Microcrystalline Quartz) with fossil inclusions

Quartz (Druzy Quartz)

Silicon Dioxide (SiO2)

Fossilized sea urchin

Echinoid fossil; commonly Cidaroida or related echinoid

Amber / Copal

Fossilized Tree Resin (Succinate)

Yellow calcite fragment

Calcite (calcium carbonate, CaCO₃)

Likely weathered feldspar-rich stone

Feldspar, probably microcline or orthoclase (KAlSi₃O₈), possibly altered pegmatite material

Milky Quartz (or Vein Quartz)

Silicon Dioxide (SiO2)

Aventurine (likely Green Aventurine)

Silicon Dioxide (SiO2) with various inclusions

Fossilized scallop shell fragment

Bivalve shell, composed primarily of calcite (CaCO₃)

Tumbled gray pebble, likely quartzite or fine-grained quartz-rich rock

Quartzite (probable), composed mainly of quartz (SiO₂)

Sandstone or Mudstone with Iron Staining

Ferruginous Sandstone/Mudstone

Tumbled pale green aventurine (probable)

Quartz, SiO₂, with dispersed fuchsite or other green inclusions

Tiger’s eye

Quartz variety, primarily silicon dioxide (SiO₂); fibrous quartz pseudomorph after crocidolite asbestos

Lepidodendron fossil (Scale Tree Bark)

Lepidodendron (Lycophytina class)

Tumbled green aventurine (likely)

Quartz, SiO₂, with fuchsite or other green inclusions

Tumbled quartz pebble (likely milky quartz)

Quartz, silicon dioxide (SiO₂)

Quartz Druze on Matrix

Silicon Dioxide (SiO2)

Likely tumbled jasper or iron-rich chert

Microcrystalline quartz (SiO₂), variably colored by iron oxides

Slag Glass (Leland Blue variant)

Anthropogenic Vitreous Silicate

Malaysian 50 Sen Coin

Coinage (specific alloy unknown without metallurgical analysis, but typically brass or bronze for this denomination and era)

Fossilized echinoid (sea urchin)

Echinoid test; commonly Cretaceous–Eocene irregular echinoid, calcite (CaCO₃)

Amethyst (as part of a multi-stone bracelet)

Silicon Dioxide (SiO2) with iron impurities

Seraphinite

Clinochlore (a variety of the chlorite group)

Tumbled white quartz pebble

Quartz (silicon dioxide, SiO₂), possibly milky quartz

Small polished pink-and-white mineral pebble

Likely rose quartz or pale pink quartz; exact identification is uncertain from the image

Granite Pebble

Granite

Weathered sandstone or iron-stained sedimentary pebble

Quartz-rich sandstone; primarily SiO₂ with iron-oxide staining

Tumbled limestone pebble

Limestone, primarily calcite (CaCO₃)