Metamorphic Rock (For Nephrite And Some Jadeite); Mineral (For Jadeite)

Slate

Foliated Metamorphic Rock (composed mainly of clay minerals or micas)

Quartz

Silicon Dioxide (SiO2)

Peacock Ore (Bornite or Chalcopyrite treated with acid)

Bornite (Cu5FeS4) or Acid-washed Chalcopyrite (CuFeS2)

Clear Quartz

Silicon Dioxide (SiO2)

Gneiss

Foliated Metamorphic Rock (Gneiss)

Smoky Quartz

Quartz (SiO₂)

Gold Ore in Quartz

Native Gold (Au) in Quartz (SiO2)

Clear Quartz

Quartz (Silicon Dioxide, SiO2)

Marble

Recrystallized Calcite (CaCO3) or Dolomite (CaMg(CO3)2)

Quartz (likely)

Quartz (SiO2 - Silicon Dioxide)

Yellow Chalcedony

Chalcedony (a cryptocrystalline variety of Quartz, SiO₂)

Gneiss

Gneiss

Gold (Elemental Metal)

Gold (Au)

Unidentifiable Rock Fragment

Ferruginous Breccia

Breccia with Iron-rich (Hematite/Goethite) Matrix

Basalt

Basalt

Sodalite

Sodalite (Na4Al3Si3O12Cl)

Clear/White Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Tiger's Eye (commonly referred to as Blue/Gold Tiger's Eye)

Tiger's Eye is a variety of Chalcedony (cryptocrystalline quartz), SiO2, exhibiting chatoyancy. The blue variety is often called Hawk's Eye.

Metagabbro / Epidote Gneiss

Epidote bearing Hornblende Gneiss

Biotite Gneiss

Gneiss (complex mixture including Biotite K(Mg,Fe)3AlSi3O10(F,OH)2 and Quartz/Feldspar)

Tourmaline (likely Schorl)

Tourmaline Group Mineral (e.g., Schorl for black varieties); (Na,Ca)(Li,Mg,Fe,Mn,Al)3Al6(BO3)3Si6O18(OH)4

Collection of Minerals and Ores

Various (e.g., Uraninite (U3O8), Carbon (C), Native Gold (Au), Hematite (Fe2O3), Galena (PbS), etc.)

Gneiss (specifically Granitic Gneiss)

Gneissic Metamorphic Rock

Milky Quartz with Iron Staining

Quartz (Silicon Dioxide, SiO2)

Milky Quartz

Quartz (SiO2)

Slag

Anthropogenic Vitrophyre (Iron or Smelting Slag)

Greenschist (Chlorite Schist)

Greenschist (containing chlorite, actinolite, and epidote)

Quartz / Quartzite

Silicon Dioxide (SiO2)

Chipped Glass/Plastic Fragment

Silicon dioxide (SiO2) for glass (amorphous) or various polymer compounds for plastic

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.

Quartzite with inclusions

Quartzite (primarily SiO2)

Green Aventurine

Silicon Dioxide (SiO2) with inclusions

Pyrite in Quartz

Iron Sulfide (FeS2) in Silicon Dioxide (SiO2)

Yellow Quartz (Citrine Quartz Pebble)

Silicon Dioxide (SiO2)

Mica Schist

Schist (Crystalline metamorphic rock)

Quartz (Pebble)

Quartz (SiO₂)

Quartz (Milky/Common)

Silicon Dioxide (SiO2)

Clear Quartz (Rock Crystal)

Silicon Dioxide (SiO2)

Banded Agate

Chalcedony / Silicon Dioxide (SiO2)