Common misconceptions in crystallography and crystal optics. [PDF]
J Appl CrystallogrSix recurrent misconceptions in crystallography, some involving mineral and crystal optics, are analyzed and discussed. The explanation of these and similar misconceptions could serve as educational resources for teachers.Did you know that an X‐ray diffraction pattern is not a spectrum?
Casas L.
europepmc +2 more sources
Mineralogy Characteristics and Coloration Mechanism of Green Tourmaline in Tanzania
Yankuang ceshi, 2022 BACKGROUND There are differences in the production characteristics, chemical composition, coloration mechanism and formation conditions of green tourmaline from different producing areas.
TAO Longfeng +3 more
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Геодинамика и тектонофизика, 2023 40Ar/39Ar analyses were made on maruyamaite (potassium-dominant tourmaline) from tourmaline-quartz-feldspar rocks discovered within the Kumdy-Kol microdiamond deposit (Kokchetav massif, North Kazakhstan).
A. V. Korsakov +3 more
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Chemical diffusivity of boron in melts of haplogranitic composition [PDF]
, 1993 Chemical diffusivities of B in synthetic melts of haplogranitic composition have been measured by the diffusion couple technique at 1 atm between 1200–1600°C.
Chakraborty, Sumit +2 more
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Evolution of ore- forming fluids in Dashkasan gold deposit, NE Qorveh, West of Iran, based on tourmaline chemical composition and fluid inclusion data [PDF]
پترولوژی, 2023 Tourmaline is a borosilicate mineral with general formula of XY3Z6[T6O18](BO3)3V3W. Experimental studies demonstrate a wide range of stability for tourmaline-supergroup minerals to record different geological processes.
Mohammad Moradi +3 more
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Metamorphic and metasomatic evolution of the Western Domain of the Karagwe-Ankole Belt (Central Africa) [PDF]
, 2020 The tectonometamorphic evolution of the Western Domain of the Karagwe-Ankole Belt, containing widespread granite-related W-Nb-Ta-Sn mineralization in pegmatites and hydrothermal quartz veins of Early Neoproterozoic age, is largely unknown.
Dewaele, Stijn +3 more
core +1 more source
Journal of Economic Geology, 2017 Introduction The study area is a part of the Sanandaj- Sirjan zone that is located in the NW of Azna city and NE of the dimension stone mine of Jan between 49° 11' 41"and 49° 16' 07" E longitude and 33° 36'35" and 33° 38'12" N latitude., A pluton of ...
Arezoo Moradi +2 more
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TOURMALINE FROM LATE QUARTZ VEINS OF THE MURTYKTY GOLD DEPOSIT, REPUBLIC OF BASHKORTOSTAN [PDF]
Минералогия, 2020 Tourmaline, an intermediate member of the oxyschorl–oxydravite–oxymagnesio-foitite-bosiite series with a predominance of the oxy-dravite-bosiite end-member, was studied from late calcitequartz veins in the eastern zone of the Murtykty gold deposit ...
M.A. Rassomakhin +3 more
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Tourmaline 40Ar/39Ar chronology of tourmaline-rich rocks from Central Iberia dates the main Variscan deformation phases [PDF]
, 2009 During crustal thickening, metapelites taken to depth release boron-bearing hydrothermal fluids because of progressive heating and dehydration. These fluids swiftly percolate upwards, especially if the crust is being actively deformed, to form tourmaline
Bea, F. +4 more
core +7 more sources
The characterization of tourmaline and its effects on plant growth
Sustinere: Journal of Environment and Sustainability, 2017 The purpose of this study was to investigate the characteristics of ACERALIVEN™, a commercial tourmaline, and to test its effect on plant growth. According to our analysis, ACERALIVEN™ belongs to the Si-Al-Mg tourmaline structure.
Sin-Yi Huang +6 more
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