Mineral Or Sedimentary Rock (With Mineral Inclusions)

Milky Quartz with Iron Inclusions

Silicon Dioxide (SiO2)

Rutilated Quartz

Silicon Dioxide (SiO2) with Titanium Dioxide (TiO2) inclusions

Sandstone

Arenite (primarily SiO2)

Orange Calcite

Calcium Carbonate (CaCO3)

Milky Quartz

Silicon Dioxide (SiO2)

Druzy Quartz on Chert/Siltstone

Silicon Dioxide (SiO2) on Microcrystalline Silica/Siltstone matrix

Agate

Silicon Dioxide (SiO2) - variety Chalcedony

Green Calcite

Calcium Carbonate (CaCO3)

Yellow Jasper (Chert variant)

Silicon Dioxide (SiO2) with iron inclusions

Sandstone (with banding)

Arenite (primarily SiO2)

Bauxite

Bauxite (Al2O3·nH2O)

Sandstone

Arenite

Jasper (likely Polychrome or Desert Jasper)

Silicon Dioxide (SiO2) with impurities

Sandstone (likely Greywacke or Lithic Sandstone)

Arenite / Wacke

Red Jasper

Silicon Dioxide (SiO2) with Hematite impurities

Chert (Flint/Chalcedony)

Microcrystalline Quartz (SiO2)

Sandstone (likely Quartzose Sandstone)

Arenite (SiO2 based)

Hematite Nodules (Moqui Marbles style)

Iron Oxide (Fe2O3)

Garden Quartz (Lodalite)

Silicon Dioxide with various mineral inclusions (SiO2)

Carnelian

Carnelian (Microcrystalline Quartz, SiO2)

Milky Quartz

Quartz (SiO2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Lepidolite in Quartz (Lithium-bearing Ore)

Lepidolite (K(Li,Al)3(Al,Si,Rb)4O10(F,OH)2) and Quartz (SiO2)

Ferruginous Quartz

Silicon Dioxide (SiO2) with Iron Oxide inclusions

Green Jasper

Jasper (Silicon Dioxide, 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.

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Jasper

Silicon Dioxide (SiO2)

Blue Quartzite

Quartzite (specifically a variety enriched with blue-coloring minerals)

Barite

Barium Sulfate (BaSO4)

Sandstone

Arenite (primarily SiO2)

Carnelian (Chalcedony)

Silicon Dioxide (SiO2) with trace Iron Oxide

Sandstone (likely River-tumbled Picture Sandstone)

Arenite (predominantly SiO2 with iron oxide impurities)

Lapis Lazuli

Lapis Lazuli (A metamorphic rock primarily composed of Lazurite: (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, along with Calcite and Pyrite)

Druzy Quartz on Chalcedony Matrix

Silicon Dioxide (SiO2)

Jasper (Iron-stained Quartzite/Chert)

Silicon Dioxide (SiO2) with iron oxide inclusions

Quartz Geode

Silicon Dioxide (SiO2)

Jasper Beach Pebble

Silicon Dioxide (SiO2) - Macro-crystalline Quartz

Yellow Jasper

Silicon Dioxide (SiO2) with goethite or iron oxide inclusions

Sandstone (Quartz-rich)

Arenite (primarily SiO2)

Conglomerate (Asphaltic/Anthropogenic)

Clastic sedimentary rock / Bituminous mixture

Glauconite (Glauconitic Sandstone)

Glauconite [(K,Na)(Fe,Al,Mg)2(Si,Al)4O10(OH)2]