Not A Rock (Man Made Origin)

Banded ironstone (likely iron-rich metamorphic rock)

Ferruginous quartzite or ironstone; exact identification requires examination of a fresh surface

Quartzite

Metamorphic quartz rock (SiO2)

Quartzite

Metamorphic Quartz Rock (SiO2)

Sandstone (Water-worn Cobble)

Arenite (SiO2 with CaCO3 or Fe2O3 cement)

Weathered feldspar-rich igneous rock, likely granite or granodiorite fragment

Granite–granodiorite; chiefly quartz (SiO₂), plagioclase and potassium feldspar, with minor dark biotite/hornblende

Brecciated Jasper

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartzite

Metamorphic Quartzite (SiO2)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Weathered basalt cobble

Basalt, a fine-grained mafic volcanic rock

Rough Emerald in Matrix

Beryl (Be3Al2Si6O18) with trace Chromium/Vanadium

Likely flint (dark chert)

Microcrystalline quartz (SiO₂), commonly called chert or flint

Bauxite

AlOx(OH)3-2x (mixture of Gibbsite, Boehmite, and Diaspore)

Lapis Lazuli (Tumbled Stone)

Na6Ca2(Al6Si6O24)(SO4,S,Cl)2 (Lazulite-rich Metamorphic Rock)

Sandstone

Arenite (SiO2 composition dominant)

Unidentified gray stone/concrete-like fragment

Indeterminate; likely a fine-grained carbonate or cementitious geological fragment

Possible basalt or iron-rich slag

Basalt (tentative; identification uncertain from image)

Sandstone

Arenite (SiO2 based)

Quartzite pebble

Quartzite (SiO2)

Pale green-gray stone, possibly serpentinite

Serpentinite (rock composed mainly of serpentine-group minerals)

Lapis Lazuli (Tumbled Specimen)

Lapis Lazuli (Aggregate rock containing Lazurite: (Na,Ca)8(AlSiO4)6(SO4,S,Cl)2)

Weathered basalt (likely vesicular basalt)

Basalt; chiefly plagioclase feldspar, pyroxene, and commonly olivine, with iron-oxide alteration

Chalk

Calcium carbonate (CaCO3)

Chalk

Calcium Carbonate (CaCO3)

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Bauxite

Bauxite (Al(OH)3, AlO(OH))

Sandstone

Sedimentary Rock (Quartz Sandstone)

Turquoise (likely stabilized or composite)

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

Bauxite

Aluminium ore (Hydrated aluminium oxides AlOx(OH)3-2x)

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

N/A (Non-Geological Specimen)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Tumbled chalcedony pendant (likely agate)

Chalcedony, microcrystalline quartz (SiO₂); the pale bands suggest agate

River Pebble (Gneiss or Quartzite)

Metamorphic rock specimen (likely Gneiss or impure Quartzite)

Weathered iron-rich rock fragment

Likely limonite/goethite-bearing ferruginous rock; exact identification requires testing

Leopard-skin jasper (likely orbicular jasper)

Silicified volcanic rock, primarily microcrystalline quartz (SiO₂) with iron-oxide and dark mineral inclusions

Red Sandstone

Quartz Arenite (iron-stained) / SiO2

Weathered quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite with iron-oxide staining

Sandstone

Arenite (specifically sublithic or quartz arenite)

Pink Granite

Phaneritic Felsic Igneous Rock (composed primarily of K-Feldspar, Quartz, and Plagioclase)

Chert (Flint)

Silicon Dioxide (SiO2)

Limpets Shell / Fossil Specimen

Patellogastropoda (Class)