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MICROPERTHITE [7 records]

Filter results by subject field Alphabetical list of terms

Filter results by subject field

Alphabetical list of terms

Record 1 2016-01-28

English

Subject field(s)
  • Mineralogy
DEF

A variety of perthite in which the intergrowths are visible only with the aid of the microscope.

CONT

This exsolving process of Na-feldspar from K-feldspar produces the group of alkali feldspars known as "perthite. "Exsolution texture visible to the unaided eye is called macroperthite and that visible only by means of the optical microscope is called microperthite.

French

Domaine(s)
  • Minéralogie
DEF

Perthite visible seulement au microscope.

CONT

Les «microperthites» sont des édifices composites d'échelle microscopique à base de feldspath potassique dans lequel de fines lamelles ou des filaments capillaires d'albite sont distribués plus ou moins régulièrement.

Spanish

Campo(s) temático(s)
  • Mineralogía
DEF

Pertita cuyos cristales de ortosa y albita son microscópicos.

Save record 1

Record 2 2013-07-30

English

Subject field(s)
  • Mineralogy
DEF

A variety of alkali feldspar syenite consisting of microperthite, arfvedsonite and aegirine.

OBS

Nepheline is sometimes present.

French

Domaine(s)
  • Minéralogie
DEF

Variété de syénite alcaline, à amphibole, riche en arfvedsonite.

Spanish

Save record 2

Record 3 2012-06-28

English

Subject field(s)
  • Mineralogy
DEF

[A] mottled black and white nepheline-syenite that also contains oligoclase, microperthite, and biotite.

French

Domaine(s)
  • Minéralogie

Spanish

Save record 3

Record 4 2011-09-29

English

Subject field(s)
  • Petrography
DEF

... a fine-grained, pale-colored, grey or pinkish rock, which consists essentially of alkali-feldspar(orthoclase, microperthite, etc).

CONT

Syngenetic U-Th mineralization occurs in bostonite dykes, which represent a highly fractionated phase of alkalic potassic magma, and epigenetic uranium and uranium-polymetallic ... occurrences are associated with the mafic to intermediate volcanic rocks.

French

Domaine(s)
  • Pétrographie
DEF

[...] syénite alcaline de grain très fin, très clair; [...]

CONT

Une minéralisation syngénétique de U-Th peut être observée dans des dykes de bostonite qui représentent une phase très fractionnée d'un magma alcalin riche en potassium, et des indices de minéralisation épigénétique d'uranium à association monométallique ou polymétallique [...] sont associés aux roches volcaniques mafiques à intermédiaires.

Spanish

Campo(s) temático(s)
  • Petrografía
DEF

Variedad de aplita casi totalmente compuesta de feldespatos alcalinos.

Save record 4

Record 5 2011-07-22

English

Subject field(s)
  • Petrography
DEF

A reddish quartz-bearing alcali syenite that has microperthite as its primary constituent with smaller amount of oligoclase, hornblende, and biotite.

OBS

Named after Nordmark, Oslo district, Norway.

French

Domaine(s)
  • Pétrographie
DEF

Syénite alcaline quartzifère, de couleur rougeâtre, contenant environ 5 % de quartz et 5 % de minéraux noirs.

OBS

Étymologie : de Nordmark (Norvège).

Spanish

Save record 5

Record 6 2011-01-17

English

Subject field(s)
  • Petrography
DEF

A rock containing less than 5% of mafites, having quartz enough to form between 5% and 50% of the leucocrates, and having an orthoclase to oligoclase-andesine ratio between 5 : 95 and 50 : 50.

CONT

Leucogranite differs from normal granite in the practical absence of mafic minerals. It therefore consists of quartz, orthoclase(microcline, microperthite, etc.), and a smaller amount of oligoclase or andesine...

OBS

leucocratic granite: term used at Natural Resources Canada - Earth Sciences Sector.

French

Domaine(s)
  • Pétrographie
DEF

Granite riche en minéraux dits «blancs» (quartz, feldspaths ou feldspathoïdes), dans lequel les minéraux foncés occupent moins de 5 % de la surface.

OBS

granite leucocrate : terme en usage à Ressources naturelles Canada - Secteur des sciences de la Terre.

Spanish

Save record 6

Record 7 1999-08-09

English

Subject field(s)
  • Mineralogy
CONT

Exsolution texture visible to the unaided eye is called macroperthite and that visible only by means of the optical microscope is called microperthite. Moonstone is a variety of cryptoperthite detectable only by X-ray diffraction or by electron microscopy.

French

Domaine(s)
  • Minéralogie

Spanish

Save record 7

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