Metamorphic Or Igneous With Mineral Inclusion

Agate (Geode nodule fragment)

Chalcedony (cryptocrystalline variety of Quartz), SiO2

Amethyst and Ruby in Zoisite

Silicon Dioxide (SiO2) and Anyolite (Zoisite-Hornblende-Ruby mix)

Orange Calcite

Calcium Carbonate (CaCO3)

Veined Quartz

SiO2 (Silicon Dioxide)

Aquamarine with Sunstone

Aquamarine (Be3Al2Si6O18), Sunstone (Na,Ca)Al(Si,Al)Si2O8

Quartz with Mica/Chlorite inclusions

Silicon Dioxide (SiO2) with phyllosilicate inclusions

Red Jasper

Silicon Dioxide (SiO2) with Hematite inclusions

Ruby

Corundum (Al2O3:Cr)

Peach Moonstone

Orthoclase Feldspar (KAlSi3O8)

Moss Agate

Moss Agate (a variety of Chalcedony, SiO ₂)

Green Quartz (Aventurine)

Silicon Dioxide with Fuchsite inclusions (SiO2 + K(Al,Cr)2(AlSi3O10)(OH)2)

Green Aventurine

Aventurine (Silicon dioxide, SiO₂)

Garden Quartz (Lodolite)

Quartz with inclusions (SiO2 + various inclusions such as Chlorite, Hematite, or Feldspar)

Rose Quartz

Rose Quartz (SiO2)

Schist (Garnet-Mica Schist)

Garnetiferous Mica Schist (primarily Muscovite/Biotite and Almandine Garnet)

Magnetite

Magnetite (Fe3O4)

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.

Dumortierite Quartz (Blue Quartz)

Al7BO3(SiO4)3O3 (Aluminum Boro-silicate included in Quartz)

Rhodonite

Manganese Silicate (Mn,Fe,Mg,Ca)SiO3

Yellow Aventurine

Silicon Dioxide (SiO2) with inclusions

Clear Quartz (or Rock Crystal)

Quartz (SiO₂ - Silicon Dioxide)

Milky Quartz

Quartz (SiO2)

Quartz (Milky/Common Quartz)

Silicon Dioxide (SiO2)

Green Aventurine and Clear Quartz

Green Aventurine (Silicon Dioxide - SiO2 with Fuchsite inclusions); Clear Quartz (Silicon Dioxide - SiO2)

Vesicular Basalt with Amygdules

Amygdaloidal Basalt

Gneiss

Gneiss (High-grade regional metamorphic rock)

Schist

Mica Schist (primarily Muscovite or Biotite sheet silicates)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Sodalite

Na8(Al6Si6O24)Cl2 (Sodalite)

Yellow Aventurine (Yellow Quartz)

Silicon Dioxide (SiO2) with inclusions of Muscovite or Mica

Quartz (Milky Quartz)

Silicon Dioxide (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Rhodonite

Manganese silicate (MnSiO3)

Yellow Aventurine

Quartz (Silicon Dioxide - SiO2) with inclusions of Mica

Gneiss (High-Grade Metamorphic Rock)

Gneiss (primarily composed of Quartz, Feldspar, and Mica/Amphiboles)

Epidote

{Ca2}{Al2Fe3+}(Si2O7)(SiO4)O(OH)

Aventurine

Silicon Dioxide (SiO2) with Fuchsite inclusions

Green Aventurine

Silicon Dioxide (Quartz) with Fuchsite inclusions (K(Al,Cr)2(AlSi3O10)(OH)2)

Dalmatian Stone

Dalmatian Jasper (a misnomer) / Perthitic Igneous Rock

Unidentifiable Rock Fragment

Rough Rose Quartz

Silicon Dioxide (SiO2) with trace amounts of titanium, iron, or manganese

Amygdaloidal Basalt

Amygdaloidal Basalt (Mafic Volcanic Rock)