CHE SIGNIFICA PEGMATITE IN INGLESE
pegmatite
Un pegmatite è una roccia ignea olocristallina, intrusiva composta da cristalli foneritici interconnessi di solito più di 2,5 cm di dimensione; Tali rocce sono definite pegmatitiche. La maggior parte dei pegmatiti sono composti di quarzo, feldspato e mica, aventi una composizione di base simile al granito. Sono note le composizioni intermedie più rari e le pegmatite mafic contenenti anfibolo, feldspato Ca-plagioclase, piroxene, feldspatoidi e altri minerali insoliti, trovati in zone ricristallizzate e apophyses associate a grandi intrusioni stratificate. La dimensione di cristallo è la caratteristica più suggestiva dei pegmatiti, con cristalli di dimensioni superiori ai 5 cm. Sono stati trovati cristalli individuali di oltre 10 metri e molti dei più grandi cristalli del mondo sono stati trovati all'interno di pegmatiti. Questi includono, spodumene, microcline, berillio e tormalina. Allo stesso modo, la struttura e la forma del cristallo nella roccia pegmatitica possono essere prese in misura estrema e perfetta. Il feldspar all'interno di un pegmatite può visualizzare gemellaggi esagerati e perfetti, lamelle di espirazione, e quando colpite da cristallizzazione idrosa, è nota la struttura grafica macroscale, con interagito con il feldspato e il quarzo.
definizione di pegmatite nel dizionario inglese
La definizione di pegmatite nel dizionario è qualsiasi di una classe di rocce ignee intrusive a grana molto grossolana costituite principalmente da quarzo e feldspato: si verificano spesso come argini tra rocce ignee di grana più fine.
PAROLE IN INGLESE ASSOCIATE CON «PEGMATITE»
pegmatite ·
formation ·
composition ·
texture ·
formed ·
gems ·
pegmatitic ·
uses ·
facts ·
holocrystalline ·
intrusive ·
igneous ·
rock ·
composed ·
interlocking ·
phaneritic ·
crystals ·
usually ·
larger ·
than ·
size ·
such ·
rocks ·
referred ·
most ·
pegmatites ·
quartz ·
feldspar ·
pegmatite ·
pictures ·
more ·
geology ·
very ·
that ·
forms ·
later ·
stages ·
magma ·
chamber ·
crystallization ·
types ·
about ·
major ·
page ·
encyclopedia ·
britannica ·
almost ·
wholly ·
crystalline ·
least ·
part ·
coarse ·
grained ·
constituents ·
which ·
typically ·
sandatlas ·
exceptionally ·
plutonic ·
mineralogical ·
purpose ·
provide ·
forum ·
those ·
interested ·
pigs ·
information ·
recent ·
10 LIBRI IN INGLESE ASSOCIATI CON «PEGMATITE»
Scopri l'uso di
pegmatite nella seguente selezione bibliografica. Libri associati con
pegmatite e piccoli estratti per contestualizzare il loro uso nella letteratura.
1
Pegmatite investigations in Colorado, Wyoming and Utah 1942-1944
The contacts between the pegmatite and wall rock are gradational. The contact is
more definite along the footwall than along the hanging wall, where the gradation
from schist to pegmatite may occur over a distance of 5 feet. In general the ...
John Bernard Hanley,
1950
Pegmatites have been mined in Connecticut since 1825. Pegmatite is defined as
an intrusive igneous rock, which means it was once hot molten rock forced into
cracks or between layers of rock where it slowly cooled and formed large crystals.
3
Geology and Petrochemistry of Granitic
Pegmatite in Jema’a ...
CHAPTER ONE 1.0 INTRODUCTION 1.1 General Statement The topic of the
research is: the Geology and the petrochemistry of granitic pegmatites in Jema'a
pegmatite field, Kaduna State. The area is located within longitude 8o 11' to 8o
23' ...
The rare co-occurrence in thin sections of the three anhydrous Li-
aluminosilicates spodumene, petalite and eucryptite has been recorded from
aplite-pegmatite dykes in the Covas de Barroso district of northern Portugal.
Spodumene was an ...
William Alexander Deer, Robert Andrew Howie,
2004
5
Progress in Metamorphic and Magmatic Petrology: A Memorial ...
crystallization of the residual melts - their formation is related to the liquid
immiscibi- lity in these melts and the separation of certain fluid (pegmatite) melts,
as has long been noted by researchers (Smith, 1948) and supported by
geological ...
6
Ilímaussaq Alkaline Complex, South Greenland: An Overview of ...
pegmatite is the lowermost exposed part of the IHmaussaq complex. It contains
xenoliths of augite syenite rimmed by amphibole and clinopyroxene crystals. A
large mass of slumped kakortokite has been mapped in the exposed layered ...
7
Giant Metallic Deposits: Future Sources of Industrial Metals
Figure 8.11. Uis tinfield, SW Namibia, typical Sn- pegmatite cross-section. From
LITHOTHEQUE No. 292, modified after Richards (1986). 1. Regolith that includes
cassiterite placers; 2. 550–460 Ma pegmatite swarm; M1. One of ~100 bodies of ...
8
The ICDP-USGS Deep Drilling Project in the Chesapeake Bay ...
JWH 128 1616.42 5303.20 Quartz vein with planar fractures JWH 95 1623.53
5326.55 Cataclastic pegmatite, quartz-rich zone JWH 62 1628.14 5341.80
Chlorite–mica schist JWH 63 1639.46 5379.25 Schist with porphyroblasts JWH
129 ...
9
Geological Survey Professional Paper
At outcrop V86, foliated granite and pegmatite containing blocks of border-facies
rock suggest slightly younger movement of the silicic main part of the pluton
along this part of the contact. The granite is medium grained (1-5 mm) to very
coarse ...
Geological Survey (U.S.),
1988
10
Field Guide to Rocks & Minerals of Southern Africa
At the Karlsbrunn pegmatite, 6.5 km south/southwest of the Albrechtshoe railway
siding, high- grade lepidolite occurred with beryl and cleavelandite feldspar and
rare petalite crystals that were up to 2.5 m long. A lepidolite- bearing pegmatite ...
10 NOTIZIE DOVE SI INCLUDE IL TERMINE «PEGMATITE»
Vedi di che si parla nei media nazionali e internazionali e come viene utilizzato il termine ino
pegmatite nel contesto delle seguenti notizie.
Eagle Plains Commences Exploration at Wollaston Project …
... overlain by calc-silicate and graphite-bearing metasedimentary rocks of the Wollaston Group, all of which have been intruded by pegmatite dykes and stocks. «Junior Mining Network, lug 15»
Skyharbour Intersects 0.172% U3O8 Over 2.5 Metres from 2015 …
The uranium and thorium mineralization is associated with pegmatite entrained in Wollaston Group pelitic and graphitic pelitic gneiss and ... «MarketWatch, lug 15»
Granite by Shannon Gugarty
Pegmatite, a type of granite, is also abundant on the hill. Wonderful gems, such as beryl, smoky quartz, feldspar, mica, hornblende, and ... «Sentinel & Enterprise, lug 15»
Tanaris Power Holdings Inc Signs Quebec Lithium Agreement
The properties are located in Quebec's two major lithium pegmatite districts and are centered on eight official occurrences listed in the ... «CNNMoney, lug 15»
Proactive news summary, including ZincOx Resources, Minera IRL …
Three distinct pegmatite belts up to 10 km long had already been identified through trench work, Premier added. Premier intends to assess ... «Proactive Investors UK, lug 15»
Premier African acquires exploration rights over tenements in Benin
Three distinct pegmatite belts up to 10 km long had already been identified through trench work. Premier will map the known artisanal sites ... «Proactive Investors UK, lug 15»
Premier African Minerals raises capital
... primarily to develop the Zulu Lithium and Tantalum project (the Zulu Project), which is a pegmatite with massive lithium mineralisation. «African Mining, lug 15»
Premier African Minerals raises £450,00 for work on lithium project
Zulu is a pegmatite formation with massive lithium mineralisation. “Ore bodies such as this lend themselves to rapid development through pilot ... «Proactive Investors UK, lug 15»
HLM Announces $450000 Financing
The deposit is an LCT (lithium- cesium- tantalum) type pegmatite. These types of pegmatites have been the principal source of hard rock lithium, tantalum, ... «Junior Mining Network, lug 15»
IM Lithium News in Brief 1 – 7 July
TSX-V-listed Houston Lake Mining Inc. has released the results of analysis on four infill drill holes at its Pak lithium pegmatite project in ... «Industrial Minerals, lug 15»