Not A Rock (Man Made Origin)

Sandstone

Arenite (primarily SiO2)

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Sandstone (Quartzose Sandstone)

Arenite (primarily SiO2 with minor Fe2O3)

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.

Lapis Lazuli (Tumbled Stone)

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

Quartzite Pebble

Metamorphosed Quartz Sandstone (SiO2)

Sandstone

Arenite (composed primarily of SiO2)

Obsidian

Volcanic Glass (Amorphous Silicon Dioxide)

Lapis Lazuli (Tumbled Specimen)

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

Bauxite

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

Pink Granite

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

Turquoise

Turquoise (Hydrated phosphate of copper and aluminium), CuAl6(PO4)4(OH)8·4H2O

Fossilized Coral (Coquina/Limestone)

Cnidaria Anthozoa (Fossilized)

Rainbow Hematite (Man-made/Treated)

Tumbled Hematite with Titanium/Anodized coating (Iron(III) oxide, Fe2O3)

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

Note: Item is a Synthetic/Man-made Object

Titanium-coated Stainless Steel (Fe-Cr-Ni-Ti)

Chert (Nodule)

Silicon Dioxide (SiO2)

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.

Sandstone

Arenite (composed primarily of SiO2)

Turquoise in Matrix

Hydrous phosphate of copper and aluminium, CuAl6(PO4)4(OH)8·4H2O

Sandstone (with potential Arkose/Lithic characteristics)

Arenite (Sedimentary rock composed of sand-sized grains)

Bauxite

Bauxite (Mixture of Al(OH)3, AlO(OH), and Fe2O3)

Granodiorite

Granodiorite (phaneritic intrusive igneous rock)

Quartz

Silicon dioxide (SiO₂)

Chert (specifically Tan/Gray Chert)

Microcrystalline quartz (SiO2)

Chondrite Meteorite

Ordinary Chondrite (S-type asteroid origin)

Red Granite

Phaneritic Plutonic Rock (High Potassium Feldspar)

Lava Stone and Chakra Beads

Basalt (with various mineral/synthetic beads)

Asphalt (Bituminous Concrete)

Bituminous Concrete / Pavement

Bauxite

Bauxite (mixture of Hydrous Aluminum Oxides)

Banded Gneiss

Gneiss (High-grade Metamorphic Rock)

Chert (Chalcedony/Agate variety)

Silicon Dioxide (SiO2)

Quartzite

Metamorphic Rock (Mainly SiO2)

Sandstone (Ferruginous)

Arenite (SiO2 with Fe2O3 inclusions)

Lapis Lazuli

Complex rock primarily containing Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2

Terracotta (Man-made ceramic brick fragment)

Baked clay / High-iron ceramic (Silicate-based ceramic)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Belemnoit (Fossil)

Belemnoidea (Order), Rostrum / Guard

Ferrous Slag (Iron Smelting By-product)

Fused Siliceous Slag

Quartz (specifically Milky or Iron-stained Quartz)

Silicon Dioxide (SiO2)

Pink Granite

Phaneritic Felsic Igneous Rock (composed of orthoclase, quartz, and plagioclase)

Granite

Phaneritic Felsic Igneous Rock