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HARD ROCK MINERALS [5 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2011-05-20

English

Subject field(s)
  • Roofs (Building Elements)
DEF

Roofing made of a hard, brittle metamorphic rock consisting mainly of clay minerals, and used as dimension stone in thin sheets for flooring, roofing, panels or chalkboard, and in granular form as surfacing on composition roofing.

CONT

Aluminum should not be considered for flashing a slate roof as its longevity is not compatible with slate.

French

Domaine(s)
  • Toitures (Éléments du bâtiment)
CONT

La couverture en ardoise est principalement utilisée au voisinage des gisements de schiste ardoisier [...] La facilité du travail de l'ardoise permet la réalisation de belles toitures, ce qui a fait choisir ce matériau pour la couverture d'édifices monumentaux dans toute la France.

OBS

Couverture. Ensemble des ouvrages et matériaux de revêtement qui assurent le «couvert» d'un édifice.

Spanish

Campo(s) temático(s)
  • Techos (Elementos de edificios)
Save record 1

Record 2 2006-05-25

English

Subject field(s)
  • Petrography
DEF

... a dark... and very hard, tough, and firmly indurated, coarse-grained sandstone [which] consists of poorly sorted and extremely angular to subangular grains of quartz and feldspar with an abundant variety of small, dark rock and mineral fragments embedded in a... compact, partly metamorphosed clayey matrix having the general composition of slate and containing an abundance of very fine-grained micaceous... and chloritic minerals;...

French

Domaine(s)
  • Pétrographie
DEF

[...] roche détritique sombre, pauvre en quartz, riche en débris de roches variées et à ciment détritique abondant très chloriteux.

Spanish

Campo(s) temático(s)
  • Petrografía
DEF

Roca detrítica formada por la consolidación de los minerales que resultan de la descomposición del granito.

CONT

Las grauvacas constan de mica, feldespatos y otros constituyentes del granito, incluyendo el cuarzo (aunque en proporciones mucho menores); todos esos elementos se hallan unidos por un cemento también detrítico. Su textura es arenosa y su color grisáceo.

OBS

grauwaka y grauwacke: nombre en alemán.

Save record 2

Record 3 2003-07-08

English

Subject field(s)
  • Deep Drilling (Mines)
  • Metals Mining
DEF

A mine located in hard rock, especially one difficult to drill, blast, and square up.

CONT

A hard rock mine is a tunnel that is dug into solid rock for the sole purpose of finding valuable or precious rocks, minerals, or metals.

OBS

Hard rock mines usually use drifts to obtain the rich ore, though, some hard rock mines are open pit.

French

Domaine(s)
  • Sondage profond (Mines)
  • Mines métalliques
CONT

[...] la redevance pour l'exploitation des placers est calculée sous forme de frais fixes, par unité de production; pour l'exploitation des mines en roche dure, sous forme de taxe sur la valeur des ventes nettes.

Spanish

Save record 3

Record 4 2002-06-25

English

Subject field(s)
  • Geochemistry
DEF

The process by which a crust or coating is formed.

OBS

incrustation(or encrustation) : A crust or hard coating of minerals formed on a rock surface; e. g. carnotite on sandstone, calcium carbonate on cave objects, and soluble salts on a playa.

French

Domaine(s)
  • Géochimie
DEF

Formation par précipitation d'une croûte rocheuse à la surface d'un objet quelconque, et à partir d'une solution sursaturée en sels de compositions diverses.

OBS

[L'incrustation] peut se produire sous un ruissellement superficiel, ou bien dans une eau calme, mais qui se renouvelle lentement ou rapidement; cette eau est dite «incrustante». L'élévation de température, la diminution de pression, la fonction chlorophyllienne des algues et la sursaturation par évaporation ou par gel sont autant de causes favorables aux incrustations de carbonate de calcium.

Spanish

Save record 4

Record 5 1999-08-03

English

Subject field(s)
  • Mineralogy
DEF

Solid minerals, as distinguished from oil and gas, esp. those solid minerals found in hard rocks.

Key term(s)
  • hard rock mineral
  • solid mineral
  • hard-rock minerals
  • hard-rock mineral

French

Domaine(s)
  • Minéralogie
Key term(s)
  • minéral solide

Spanish

Save record 5

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