Not A Rock (Man Made Origin)

Anthropogenic Heat Source (Electronic/Industrial Interface)

Thermal IR emission (Electronic infrastructure)

Blue Lace Agate

Chalcedony (SiO2) with trace inclusions

Likely weathered limestone or calcareous tuff

Calcite-rich carbonate rock, chiefly CaCO₃; exact identification is uncertain from the image

Black Diamond (Carbonado)

Carbonado (Polycrystalline Diamond)

Porphyritic Basalt (Chinese Writing Stone/Flower Stone)

Porphyritic Basalt (primarily Plagioclase Feldspar in a Mafic groundmass)

Turquoise

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

Chondrite Meteorite

Stony Meteorite (Ordinary Chondrite)

Rainbow Hematite (Man-made/Treated)

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

Glass / Silicon Dioxide (Man-made)

SiO2 (Amorphous Silicon Dioxide)

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

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

Green Agate

Silicon dioxide (SiO₂)

Quartz-rich rock, likely milky quartz or quartzite

Quartz (SiO₂), possibly quartzite if metamorphically recrystallized

Metallic Ornament / Jewelry

N/A - This is an artificial object, not a geological specimen.

Granite

Plutonic Igneous Rock (composed typically of SiO2, Al2O3, K2O, Na2O, CaO)

Coquina

Bioclastic Limestone (composed primarily of CaCO3)

Shungite

Fullerene-bearing carbonaceous rock

Rough Sapphire (Corundum)

Corundum (Al2O3)

Pink Granite

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

Rough Quartz (or Quartzite pebble)

Silicon Dioxide (SiO2)

Red Sandstone

Arenite (Ferruginous Sandstone)

Bauxite

Bauxite (principal ore of aluminum, primarily Al(OH)3)

Smoky Quartz

Silicon dioxide (SiO2)

Black Obsidian

Obsidian (Volcanic Glass, SiO2 + impurities)

Zircon

Zircon (Zirconium Silicate - ZrSiO4)

Pink Granite

Felsic Intrusive Igneous Rock (composed primarily of K-Feldspar, Quartz, and Mica)

Slate

Metamorphic Pelitic Rock

Lapis Lazuli (Tumbled)

Lazurite-dominated contact metamorphic rock

Lapis Lazuli

Na8[Al6Si6O24]Sn (Lazurite-rich metamorphic rock)

Granite

Felsic Plutonic Rock (primarily Quartz, Potassium Feldspar, and Plagioclase)

Lapis Lazuli

Lazurite-dominant Metamorphic Rock (complex aluminosilicate)

Granite / Diorite (Granodiorite)

Granodiorite / Quartz Diorite

Sandstone Concretion

Sedimentary concretion

Quartz (Druzy/Macro-crystalline)

Silicon Dioxide (SiO2)

River Pebble (Gneiss or Quartzite)

Metamorphic rock specimen (likely Gneiss or impure Quartzite)

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.

Sandstone

Arenite (with iron oxide cement)

Quartz-rich pegmatite or quartz vein rock

Mostly quartz (SiO₂), with probable feldspar and iron-oxide staining

Red Coral (Precious Coral)

Corallium rubrum (Calcium Carbonate, CaCO3)

Weathered quartz-rich rock, likely milky quartz or quartzite

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

Note on Image Identification: Textile

N/A (Anthropogenic material)

Note: Item is a Synthetic/Man-made Object

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

Granite (Polished Countertop Surface)

Plutonic Igneous Rock (Felsic)