Alunite

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neuter noun (mineralogy / geology)

Definition

A natural mineral from the class of hydrated sulfates, structurally composed of a basic aluminum and potassium sulfate, having the chemical formula KAl3(SO4)2(OH)6. Historically called alumstone, it occurs as granular, fibrous masses or white, grayish, or reddish rhombohedral crystals, used on an industrial scale for extracting alum and aluminum.

Bilingual Equivalents

  • Alunite
  • Alumstone

Grammatical & Source Details

Inflection Type Neuter noun with regular scientific and grammatical structural variations.
Formation Neologism borrowed from French 'alunite', rooted historically in the Latin term for alum.
Spelling / Pronunciation [a.lu.ˈnit]
Source Handbook of Mineralogy and Advanced Geological Sciences

Contextual Usage Examples

RO: Geologii au descoperit un zăcământ masiv de alunit în apropierea vechiului masiv vulcanic din regiune.

EN: Geologists discovered a massive alunite deposit near the old volcanic massif in the region.

RO: Prin calcinarea și spălarea mineralului numit alunit se obține alaunul pur utilizat în industria textilă.

EN: By calcining and washing the mineral called alunite, pure alum used in the textile industry is obtained.

RO: Acest eșantion rar de alunit prezintă incluziuni cristaline de un roșu pal, extrem de interesante pentru cercetători.

EN: This rare alunite specimen displays pale red crystalline inclusions, extremely interesting for researchers.

Idioms & Phrases

Zăcământ de alunit / Alunite deposit

RO: Acumulare geologică de roci bogate în acest mineral, exploatată pentru producția industrială de compuși de aluminiu.

EN: A geological accumulation of rocks rich in this mineral, exploited for the industrial production of aluminum compounds.

Alunit masiv / Massive alunite

RO: Varietate texturală compactă și granulară a mineralului, lipsită de cristale individuale vizibile cu ochiul liber.

EN: A compact and granular textural variety of the mineral, lacking individual crystals visible to the naked eye.

Proces de alunitizare / Alunitization process

RO: Fenomen geologic de alterare hidrotermală a rocilor vulcanice bogate în feldspați sub acțiunea soluțiilor acide.

EN: A geological phenomenon of hydrothermal alteration of feldspar-rich volcanic rocks under the action of acid solutions.

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