igneous

Giallo Ornamental Granite

Phaneritic Igneous Rock (composed of Quartz, Feldspar, and Mica)

Hardness: 6-7 on Mohs scale; Color: Creamy white to golden yellow background with grey/brown/black speckles; Luster: Vitreous/Polished; Crystal Structure: Medium to coarse-grained crystalline; Specific Gravity: 2.6-2.7

Hardness: 6-7 on Mohs scale
Luster: Vitreous/Polished

Identified May 6, 2026More igneous →

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Physical properties

Formation & geological history

Formed through the slow cooling and crystallization of molten magma beneath the Earth's surface. These plutonic rocks typically date back to the Precambrian or Paleozoic eras and form in continental crust environments.

Uses & applications

Extensively used in construction for kitchen countertops, bathroom vanities, flooring, wall cladding, and exterior landscaping due to its durability and aesthetic appeal.

Geological facts

While sold as 'Granite' in the trade, some variations showing swirling patterns might technically be classified as Gneiss, a metamorphic rock. It is one of the most popular natural stones imported from Brazil.

Field identification & locations

Identify by its distinctive phaneritic texture where individual mineral grains (milky quartz, pinkish/white feldspar, and dark biotite mica) are visible to the naked eye. Commonly quarried in Brazil.

Other igneous specimens

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Blue Apatite

Fluorapatite (Ca5(PO4)3F)

mineral

Dark Igneous Rock (Likely Basalt or Diabase)

Basalt (extrusive igneous rock) or Diabase (intrusive igneous rock - also known as Dolerite), largely composed of plagioclase feldspar, pyroxene (augite), and sometimes olivine and amphibole. Exact mineralogy would require thin section analysis.

Igneous

Magnetite

Iron(II,III) oxide (Fe3O4)

mineral

Blue Apatite

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

mineral

Sodalite

Sodalite - Na8(Al6Si6O24)Cl2

mineral

Magnetite

Magnetite (Fe3O4)

mineral