Mineral (Processed Alloy)

Nephrite Jade

Nephrite

Blue Apatite

Apatite (Calcium Phosphate) - Ca5(PO4)3(F,Cl,OH)

Limonite (Iron Ore)

FeO(OH)·nH2O (Hydrated iron(III) oxide-hydroxide mixture)

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2 with iron oxide inclusions)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Falcon's Eye (Blue Tiger's Eye)

Pseudomorph of Quartz after Crocidolite (SiO2)

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.

Picture Jasper

Silicon Dioxide (SiO2) with iron oxide and mineral inclusions

Quartz on Sandstone

Silicon Dioxide (SiO2) in Lithic Sandstone

Cobaltian Calcite

Cobalt-bearing Calcite (Ca,Co)CO3

Prehnite

Prehnite (Ca2Al(AlSi3O10)(OH)2)

Rose Quartz

Silicon Dioxide (SiO2)

Milky Quartz Pebble

Silicon Dioxide (SiO2)

Yellow Aventurine (Yellow Quartzite)

Silicon Dioxide (SiO2) with inclusions

Dyed Quartz (often sold as 'Blue Quartz' or 'Blue Agate')

Silicon Dioxide (SiO2) with artificial pigment

Tiger's Eye

Pseudomorph of Quartz after Crocidolite (SiO2)

White Calcite

Calcium Carbonate (CaCO3)

Chalcopyrite in Quartz (Gossan/Iron Hat)

CuFeS2 (Chalcopyrite) with SiO2 (Quartz)

Calcite (commonly referred to as Orange Calcite or Honey Calcite given its color)

Calcite

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Chert (specifically Jasper/Carnelian variety)

Microcrystalline quartz (SiO2)

Pink Granite

Granite (Phaneritic intrusive rock)

Granite (Orthoclase rich)

Granite (composed primarily of Quartz and Potassium Feldspar KAlSi3O8)

Green Aventurine

Aventurine Quartz (SiO2 with Fuchsite inclusions)

Mica Schist

Schist (primarily Muscovite and Biotite mica)

Quartz (Common or Milky Quartz)

Silicon Dioxide (SiO2)

Dyed Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Orange Calcite

Calcium Carbonate (CaCO3)

Synthetic Ruby (Jewel Bearings)

Synthetic Corundum (Al2O3 doped with Chromium)

Milky Quartz

Silicon Dioxide (SiO2)

Hematite

Iron(III) oxide (Fe2O3)

Blue Aventurine

Quartzite with inclusions of Dumortierite (SiO2 + Al7(BO3)(SiO4)3O3)

Mica Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Quartz (Variety: Citrine or Tumbled Chalcedony)

Silicon Dioxide (SiO2)

Lepidolite

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2)

Blue Calcite

Calcium Carbonate (CaCO3)

Gold

Gold (Au)

Assorted Decorative Tumbled Stones (Quartz, Sodalite, Aventurine, Calcite)

Mixed Silicates and Carbonates (SiO2, Na8(Al6Si6O24)Cl2, CaCO3)

Sandstone (Ferruginous)

Arenite with Iron-Oxide Cement (primarily SiO2 with Fe2O3/FeOOH)

Gossan (Iron Hat) with Quartz and Chlorite

Limonite/Goethite-rich Gossan (FeO(OH)·nH2O) with inclusions of Quartz and Chlorite

Pink Granite

Granite (High K-Feldspar variety)

Limonite (Yellow Ochre)

Hydrated iron(III) oxide-hydroxide (FeO(OH)·nH2O)