The Atomic Arrangement of Cr-rich Tourmaline from the #1 Mine, Balmat, St. Lawrence County, New York, USA

Chromium-bearing tourmalines are rare. Chromium-rich tourmaline from the northwestern part of the Adirondack Mountains in the Adirondack Lowlands is among the most chromium-rich tourmalines found to date. The mineral, with >21.0 wt. % Cr2O3, is from the marble-hosted talc–tremolite–cummingtonite...

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Bibliographic Details
Published in:Minerals (Basel) 2019-07, Vol.9 (7), p.398
Main Authors: Dannenberg, Steven, Di Paolo, Devany, Ehlers, Alix, McCarthy, Kyle, Mancini, Mark, Reuter, Matthew, Seth, Dennis, Song, Zihui, Valladares, Maria, Zhu, Xuanfu, Hughes, John, Lupulescu, Marian
Format: Article
Language:English
Subjects:
Adhesion
Aluminum
Analytical chemistry
Balmat mine
Cations
Chemical analysis
Chromium
chromium-dravite
Conflicts of interest
Crystal structure
Geology
Low concentrations
Magnesium
Marble
Minerals
Mountains
Museums
New York
Optimization
Organic chemistry
Scattering
Silicate minerals
Silicates
St. Lawrence County
Substitutes
Tourmaline
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Summary:Chromium-bearing tourmalines are rare. Chromium-rich tourmaline from the northwestern part of the Adirondack Mountains in the Adirondack Lowlands is among the most chromium-rich tourmalines found to date. The mineral, with >21.0 wt. % Cr2O3, is from the marble-hosted talc–tremolite–cummingtonite schist in the #1 mine in Balmat, St. Lawrence County, New York. The atomic arrangement of the sample (a = 16.0242(3) Å, c = 7.3002(2) Å) was refined to R1 = 0.0139. The composition, from chemical analyses and optimization of the formula, is X(Ca0.22Na0.69K0.01) Y(Cr3+1.68Mg0.80Ti0.13V0.06Mn0.02Fe0.02Li0.29) Z(Al3.11Cr3+1.18Mg1.70Fe0.01) T(Si5.93Al0.07) B3O27 OH3.99 F0.01. There has been extensive debate over the ordering of Cr3+ between the tourmaline Y and Z octahedral sites. Recent work has suggested that, at low concentrations (
ISSN:2075-163X
2075-163X
DOI:10.3390/min9070398