Mineral (Processed Alloy)

Sandstone

Arenite (general term for sandstone)

Sedimentary Rock

Quartz

Quartz (SiO₂)

Mineral

Granite (tumbled pebble)

Granite (Plutonic Igneous Rock)

Igneous Rock

Greywacke (likely)

Greywacke (a type of sandstone)

Goldstone

N/A (Synthetic Glass with Copper Inclusions)

Manufactured Glass

Scoria

Scoria (a vesicular basalt or andesite)

Mineral, specifically an iron ore

Iron Ore / Ironstone Concretion

Mixture of iron oxide/hydroxide minerals, likely some combination of Hematite (Fe2O3), Goethite (α-FeOOH), and Limonite (a general term for hydrated iron oxides of variable composition) or potentially Bauxite (a mixture of aluminum hydroxides, often with iron oxides, (Al(OH)3) and FeO(OH)). The visual characteristics strongly suggest iron-rich material.

Quartz (possibly milky quartz)

Quartz (Silica; SiO₂)

Mineral

Marble

Marble (metamorphosed limestone/dolostone). Predominantly composed of Calcite (CaCO3) for marble derived from limestone, or Dolomite (CaMg(CO3)2) for marble derived from dolostone.

Metamorphic Rock

Banded Metamorphic Rock (likely Quartzite or Serpentinite/Soapstone)

Metamorphic Rock (possibly a banded Quartzite or a foliated Serpentinite/Talc Schist based on appearance, general term for such a rock is 'Banded Metamorphic Rock' or 'Gneiss' if pronounced banding of different minerals)

Metamorphic

Golden Sheen Obsidian

Obsidian (volcanic glass) with inclusions of gas bubbles and mineral crystals (e.g., hematite, magnetite) causing the sheen

Puddingstone

Conglomerate (specifically a type of jasper conglomerate or quartz conglomerate)

Pumice

Pumice (volcanic rock)

Igneous

Fluorite

Fluorite (Calcium Fluoride, CaF2)

mineral

Basalt

Basalt (dominated by plagioclase feldspar and pyroxene)

Sandstone (Pebble/Cobble)

Sandstone (arenite is a more precise term for sandstone with less than 15% matrix; this specimen appears to be a lithic or quartz arenite)

Conglomerate

Sedimentary Rock (possibly a conglomerate or coarse-grained sandstone)

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)

Obsidian (likely Golden Sheen Obsidian or Rainbow Obsidian, given the subtle sheen visible on some beads)

Obsidian (volcanic glass, predominantly SiO2 with various impurities)

Igneous

Quartz

Quartz (SiO2 - Silicon Dioxide)

Mineral, often found as detrital grains in sedimentary rocks

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

Jasper

Silicon Dioxide (Microcrystalline Quartz / Chalcedony)

Mineral, specifically a Cryptocrystalline Quartz variety

Granite (likely a river or beach pebble)

Granite (a felsic intrusive igneous rock primarily composed of quartz, feldspar, and mica)

Igneous

Agate (or Banded Agate)

Agate (a variety of Chalcedony, which is a cryptocrystalline form of Quartz); Chemical Formula: SiO₂ (Silicon Dioxide)

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Mineral/Rock

Jade

Jadeite or Nephrite

Mineral/Mineraloid

Red Jasper

Jasper (Silicon Dioxide with Iron Oxide inclusions, SiO2)

Unable to identify - Image contains non-geological items

N/A

Green Schist

Greenschist (Chlorite Schist)

Schist

Schist (various mineralogical compositions including mica, chlorite, talc, etc.)

Metamorphic

Chert (Flint Nodule)

Microcrystalline or cryptocrystalline quartz (SiO2)

Schist

Crystalline Metamorphic Rock (Schistose)

Sedimentary (most likely, as Chert is a sedimentary rock often found as nodules in limestone or as bedded deposits; however, it can also form by metasomatic replacement, which leans towards metamorphic processes under certain conditions)

Chert or Flint (polished/water-worn)

Chert (a microcrystalline or cryptocrystalline variety of quartz, SiO2). Flint is a specific variety of chert.

Uvarovite

Ca3Cr2(SiO4)3

mineral

Petrified Wood

Silicified Wood (SiO2)

Chert (Flint)

Cryptocrystalline Quartz (SiO2)

Schist

N/A (a rock type, not a mineral formula)

Banded Gneiss

Gneiss (High-grade Regional Metamorphic Rock)

Porphyritic Basalt

Extrusive igneous rock with plagioclase phenocrysts

Black Opal (Kalimaya)

Hydrated Silica (SiO2·nH2O)

mineraloid

Snowflake Obsidian

Volcanic Glass with Cristobalite Inclusions