Results 21 to 30 of about 3,307 (182)
FIRST FINDS OF BADDELEYITE IN ALKALINE COMPLEX OF THE VISHNEVYE MOUNTAINS, SOUTH URALS [PDF]
Минералогия, 2018 Baddeleyite ZrO2 is identified in abundant assemblages with zircon in alkali pegmatites of the Vishnevogorsky complex. The mineral contains Hf, Nb, and Ca in chemical composition. Its occurrence in form of accessory mineral is predicted for various rocks
V.A. Popov, I.A. Blinov
doaj
ZIRCONOLITE OF ALKALINE PEGMATITES OF THE VISHNEVYE MOUNTAINS: THE FIRST FINDINGS IN THE SOUTH URALS [PDF]
Минералогия, 2018 Zirconolite, a complex oxide with an idealized formula (Ca,REE)Zr(Ti,Fe,Nb)2O7 , is an accessory mineral of Nb ores from alkali pegmatites and carbonatites of the Vishnevogorsk alkaline complex (South Urals, Russia).
V.A. Popov +3 more
doaj
NEW FINDINGS OF RARE MINERALS IN PEGMATITES OF VISHNEVYE MOUNTAINS IN THE SOUTHERN URALS [PDF]
Минералогия, 2019 In addition to previously known 221 minerals, 11 new rare minerals were identified in alkali pegmatites of the Vishnevye Mountains. Yttrialite-(Y)Y2(Si2O7) and huanghoite-(Ce) aCe(CO3 2F were found for the first time in the Urals.
V.I. Popova +6 more
doaj
Journal of Economic Geology, 2019 Introduction The Saghand mining district is a part of Bafq-Saghand metallogenic zone in the Central Iranian geostructural zone which is located in northeast of city of Yazd.
Saleh Deymar +3 more
doaj +1 more source
CONCENTRIC-ZONAL AGGREGATE OF REE MINERALS IN FELDSPAR PEGMATITE OF THE VISHNEVYE MOUNTAINS, SOUTH URALS [PDF]
Минералогия, 2019 A concentric-zonal texture of mineral aggregate observed in alkali pegmatite of the Vishnevye Mountains was formed as a result of melt-fluid crystallization in a closed system.
V.A. Popov
doaj
Crystal chemistry and trace-element behaviour in tourmalines from Minas Gerais, Brazil [PDF]
European Journal of MineralogyA series of 17 museum tourmaline samples from several pegmatites of Minas Gerais, Brazil, were investigated by several techniques including single-crystal X-ray structure refinements, electron microprobe, and laser ablation inductively coupled plasma ...
F. Bomal +7 more
doaj +1 more source
The structure and petrology of the Cnoc nan Cuilean Intrusion, Loch Loyal Syenite Complex, NW Scotland [PDF]
, 2013 In NW Scotland, several alkaline intrusive complexes of Silurian age intrude the Caledonian orogenic front. The most northerly is the Loch Loyal Syenite Complex, which is divided into three separate intrusions (Ben Loyal, Beinn Stumanadh and Cnoc nan ...
Goodenough, Kathryn M. +5 more
core +3 more sources
Academy Journal of Science and Engineering, 2022 Pegmatites occur in association with amphibolites, minor granite-gneiss and quartzites in central Nigeria. Findings on their economic potentials are yet to reveal more representative and accurate depiction of their characteristics.
Adeyemi, O.O. +2 more
doaj
The Journal of the Geological Society of Japan, 2008 滋賀県大津市田上花崗岩体小ペグマタイト中にできている長径数cm程度のマントル長石は，白色コア部を薄い無色透明リム部が包んでいるアルカリ長石である．鏡下では，コア部は汚濁を伴ったラメラ－パッチマイクロパーサイト組織を示しているが，リム部はほぼ均質であり清澄である．鏡下での汚濁・清澄の違いはコア部にはマイクロポアが圧倒的に多いこと，清澄なリム部には殆どないことに対応する．本長石の形成過程は，次のようである．最初に，550～600℃程度（PH2O＝2～3 kb）でOr76Ab24のコア部が晶出した．その後，450℃前後で離溶クリプトパーサイトが形成されそれが少しずつ粗大化した．クリプトパーサイトは，熱水反応によりマイクロパーサイトへと変化し，200 ...
Toshio Kohno +2 more
openaire +2 more sources
Pegmatites of Southern California [PDF]
, 1954 For many years the southern California region has attracted the attention of geologists interested in pegmatites and pegmatite deposits, largely because of the well-known gem and lithium occurrences in San Diego and Riverside Counties. These world-famous
Jahns, Richard H.
core