Mineral Health

Black Marble

Recrystallized Calcite (CaCO3)

Citrine Quartz

Silicon Dioxide (SiO2)

Peach Moonstone

Orthoclase (Potassium Aluminum Silicate, KAlSi3O8)

Rutilated Quartz

Quartz with Rutile inclusions (SiO2 with TiO2)

Amethyst

SiO2 (Silicon Dioxide)

Moonstone (Tumbled)

Orthoclase Feldspar (KAlSi3O8) with inclusions of Albite

Peach Moonstone

Orthoclase (KAlSi3O8)

Green Quartz (Prasiolite variant or Aventurine)

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.

Schist with Biotite and Quartz

Biotite-Quartz Schist (Fe,Mg,Al silicate mix)

Malachite

Copper carbonate hydroxide [Cu2CO3(OH)2]

Fluorite (likely Fluorite on Quartz/Matrix)

Calcium Fluoride (CaF2)

Milky Quartz

Quartz (Silicon Dioxide, SiO2)

Orthoclase Feldspar

Orthoclase (KAlSi₃O₈)

Lapis Lazuli

Lapis Lazuli (Rock composed primarily of Lazurite (Na,Ca)8(AlSiO4)6(S,Cl,SO4,OH)2, Calcite, and Pyrite)

Granite

Granite

Pebble

Clast (specifically a granule or small pebble)

Chrysocolla

Chrysocolla (Cu2-xAlx(H2-xSi2O5)(OH)4·nH2O)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Milky Quartz with Mineral Inclusions

Quartz (Silicon Dioxide, SiO2)

Silver (Native Silver Mineral)

Ag (Native Silver), Alloyed 90% Ag / 10% Cu

General Rock and Mineral Collection (Center: Angelite / Blue Anhydrite)

Anhydrite (Calcium Sulfate, CaSO4)

Milky Quartz with Mineral Inclusions

Silicon Dioxide (SiO2)

Pearl (as a biogenic mineral/gemstone)

Calcium Carbonate (mostly Aragonite), CaCO3

Pyrite (Fool's Gold)

Iron Sulfide (FeS2)

Lapis Lazuli (Raw)

Lazurite-rich metamorphic rock; Na3Ca(Al3Si3O12)S

Fluorite (Rainbow/Purple Fluorite)

Calcium Fluoride (CaF2)

Granodiorite

Granodiorite

Quartz Geode

Crystalline Silicon Dioxide (SiO2) in Geode

Chrysocolla

Hydrated copper phyllosilicate mineral (Cu,Al)2H2Si2O5(OH)4·n(H2O)

Prehnite

Prehnite, Ca2Al(AlSi3O10)(OH)2

Calcite (Yellow/Orange variety - sometimes called Honey Calcite)

Calcite

Red Sandstone

Arenite (Ferruginous Sandstone)

Shale or Slate with Quartz Veins

Shale (fine-grained clastic sedimentary rock) or Slate (low-grade metamorphic rock formed from shale) with Quartz (SiO2) veins

Malachite

Copper carbonate hydroxide Cu2CO3(OH)2

Spiny Oyster Shell

Spondylus (Calcium Carbonate, CaCO3)

Limonite/Hematite Ironstone

Goethite-rich Ironstone (FeO(OH) · nH2O)

Brimstone (Native Sulfur)

Native Sulfur (S)

Malachite

Malachite - Cu2CO3(OH)2

Sandstone

Arenite (Clastic Sedimentary Rock)

Turquoise

Hydrated phosphate of copper and aluminium (CuAl6(PO4)4(OH)8·4H2O)

Fuchsite (Chrome Mica)

K(Al,Cr)2(AlSi3O10)(OH)2