Igneous And Metamorphic

Aventurine (likely Green Aventurine)

Quartz (SiO2) with included minerals (Fuchsite or Chlorite for green color)

Baroque Pearl (and potentially a small Sapphire/Blue Topaz)

Pearl: Calcium Carbonate (aragonite or calcite) with conchiolin. Sapphire: Aluminum Oxide (Al2O3). Blue Topaz: Al2SiO4(F,OH)2.

Green Aventurine and Clear Quartz

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

Rutilated Quartz (likely Citrine or Smoky Quartz with Rutile inclusions)

SiO2 with TiO2 inclusions (Quartz with Rutile)

Mixed Chalcedony and Jasper Bracelet (possibly 'Ocean Jasper' or similar banded variety for brown beads, and blue/grey Chalcedony for the translucent beads)

Chalcedony (SiO2), Jasper (SiO2 with impurities)

Mixed Quartz and River Pebbles (Stone Collection)

Mixed assortment containing mainly Silicon Dioxide (SiO2)

Limonitic Gossan

Goethite/Limonite aggregate after sulfide

Mixed Tumbled Gemstones and River Rocks

Mixed Decorative Stones (predominantly Silicon Dioxide - SiO2 variants)

Mica (specimen appears to be Muscovite or Phlogopite)

Phyllosilicate mineral; Muscovite: KAl2(AlSi3O10)(F,OH)2

Calcite (or Alabaster, if truly carved)

Calcium Carbonate (CaCO3)

Pet Rock (Man-made Quartzite or Granite Cobble)

Silicon dioxide (SiO2) mixture; commonly composed of Quartz, Feldspar, and Mica

Pyrite (locally known as Fool's Gold)

Iron Sulfide (FeS2)

Blue Apatite

Apatite (Group), Ca5(PO4)3(F,Cl,OH)

Nephrite Jade

Nephrite

Sapphire

Corundum (Al2O3)

Zoisite with Ruby (Anyolite)

Zoisite – Ca2Al3(SiO4)3(OH) with inclusions of Ruby (Al2O3:Cr)

Biotite or Phlogopite Mica

K(Mg,Fe)3(AlSi3O10)(F,OH)2

Magnetite

Iron(II,III) oxide (Fe3O4)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Epidote

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

Quartz

Silicon Dioxide (SiO2)

Rhodonite, Gray Moonstone, and White Feldspar Mix

Multiple: MnSiO3 (Rhodonite), (K,Na)AlSi3O8 (Feldspar/Moonstone)

Ruby (Corundum)

Aluminum oxide (Al2O3) with Chromium traces

Milky Quartz

Quartz (SiO2)

Milky Quartz

Silicon Dioxide (SiO2)

Magnetite

Magnetite (Iron(II,III) oxide, Fe3O4)

Sodalite

Sodalite (Na8(Al6Si6O24)Cl2)

Blue Apatite

Fluorapatite (Ca5(PO4)3F)

Magnetite (Small Granule)

Magnetite (Fe3O4)

Milky Quartz with Iron Staining

Silicon Dioxide (SiO2)

Venetian Gold Granite

Phaneritic Felsic Igneous Rock (Granite)

Milky Quartz

Quartz (Silicon Dioxide - SiO2)

Magnetite (Iron Ore)

Magnetite (Fe3O4)

Magnetite Orthorthotropic Rock

Magnetite (Fe3O4)

Green Aventurine

Silicon Dioxide (SiO2) with Chromium-rich Fuchsite mica

Natural Gemstone Cabochons (Ruby, Moonstone, Emerald, Citrine)

Ruby (Al2O3:Cr), Moonstone (KAlSi3O8), Emerald (Be3Al2(SiO3)6:Cr), Citrine (SiO2)

Garnet (Almandine/Pyrope series)

Silicate mineral (Almandine: Fe3Al2Si3O12; Pyrope: Mg3Al2Si3O12)

Muscovite Mica

Muscovite (KAl2(AlSi3O10)(OH)2)

Quartz with Muscovite Mica

Silicon Dioxide (SiO2) with Potassium Aluminum Silicate Hydroxide Fluoride (KAl2(AlSi3O10)(F,OH)2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Quartz

Silicon dioxide (SiO2)