TINGUAITE Meaning and
Definition
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Tinguaite is a rare and distinctive mineral that belongs to the group of silicate minerals known as amphiboles. It typically forms as a product of metamorphism, which occurs when pre-existing rocks undergo intense heat and pressure deep within the Earth's crust.
In terms of its physical properties, tinguaite is characterized by its vitreous to pearly luster and range of colors, including shades of black, green, and brown. It commonly displays a prismatic or columnar crystal habit, with elongated and slender crystals that sometimes occur in radiating or fibrous aggregates. The mineral has a good cleavage and a slightly brittle tenacity, making it easy to break or split along certain planes.
Chemically, tinguaite is a complex sodium-calcium-iron-magnesium-aluminum silicate that is rich in iron and aluminum. Its chemical formula can vary depending on the specific composition, but it is generally classified as a member of the amphibole group.
While tinguaite is relatively scarce and lacks significant economic value, it is highly regarded among mineral collectors and enthusiasts for its aesthetic appeal and rarity. It is often sought after for its unique color combinations and distinct crystal habits. Its name is derived from the Tingua River Valley in Brazil, where it was first discovered and identified.
Etymology of TINGUAITE
The word "tinguaite" has a rather complex etymology, as it is derived from multiple sources. Tinguaite is a type of igneous rock, specifically a variety of basalt, which was first discovered in the Tinguá region of Rio de Janeiro state, Brazil.
The name "Tinguá" itself has indigenous origins, coming from the Tupi-Guarani language spoken by the native tribes of Brazil. In Tupi, "Tin" means "rock" and "gua" means "black", essentially referring to the black rocks found in the region.
The suffix "-ite" in "tinguaite" is a common suffix used in mineralogy to denote a rock or mineral. It derives from the German suffix "-it", which indicates a mineral or rock type. This suffix, in turn, comes from the Greek "-ites", which has a similar meaning.
