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dipyramids and As tetrahedra, are linked through corner-sharing at S1 and S2. These chains align parallel to the c axis, and the structure repeats with each alternating chain undergoing a 180° rotation and shifting up and down the A axis. Fangite has an ideal chemical formula of
736:
Sen Gupta, P.K., Robinson, P.D., and
Criddle, A.J., 1993, Fangite, TlrAsSo, a new thallium arsenic sulfosalt from the Mercur Au deposit, Utah, and revised optical data for gillulyite (J. R. Wilson, Ed.): American Mineralogist, v. 78, p. 1096–1103.
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with an average bond length of 3.17 Å is formed with the
Thallium (Tl) atom, coordinated in a fivefold manner with S. The Thallium (Tl) atom is also coordinated sevenfold with Sulfur (S), creating a monocapped
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trigonal dipyramids arranged in zigzag chains along the a-axis, connected in the c-direction by As tetrahedra. These tetrahedra share an edge and two vertices with the dipyramids, creating nearly planar
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in synthetic material, grains are present that reflect away unwanted components. It is concluded that fangite has a very low birefringence with a difference of Y% of 0.4. The consistent decrease in
369:, Smithsonian Institution. The International Mineralogical Association Commission approved the name Fangite after Dr. Jen-Ho Fang, a crystal chemist affiliated with the
533:). However, proustite is distinctly bireflectant and appears more purplish-red due to its somewhat higher reflectance at the blue end of the spectrum.
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Fangite has a vitreous luster that turns metallic when tarnished. When examining fangite in a polished section, only one grain could be used to test
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595:-As polyhedral layers aligned with the (010) plane. The linkage between these layers is in the b-direction by interlayer Tl atoms.
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409:, and other sulfide minerals. Based on surrounding materials, it can be concluded that Fangite forms as a result of alteration of
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and a metallic luster when tarnished. The original sample of fangite was too small to determine hardness. Synthetic
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aligns with the blue-gray appearance of fangite in polished sections. This appearance corresponds to its red and
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582:. When examining an isolated chain from the b-axis, it is apparent that the previously described chain is a Tl
679:. Synthetic material was supplied by M. Gottlieb, associated with the Westinghouse Research Laboratories in
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was also used for assessing streak, revealing an orange color. Fangite exhibits a blue-gray luster with low
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549:. When examining the crystal structure of fangite along the a-axis, it is apparent that fangite exhibits a
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stockpile within the Morrin Hill pit at the Mercur gold deposit. Fangite is associated with subhedral
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coordination with Sulfur (S) featuring an average bond length of 2.172 Å. A distorted
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517:. Comparing these reflectance spectra with those in the Quantitative Data File for
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was collected from synthetic fangite using a
Gondolfi pattern, using an automated
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683:. Through analysis, it is concluded that fangite is a part of the orthorhombic
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due to the abundant presence of internal red reflections. Due to the angles of
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with an average bond length of 3.288 Å. Chains, comprising alternating Tl
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of Pnma. Unit cell, dimensions were also analyzed, revealing: a=8.894(8)
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reveals similarities between R1 and R2 of fangite and the R2 values of
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arrangement. Arsenic (As) atoms in this orientation display perfect
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and fine-grained sulfide indicating partial replacement of pyrite,
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and red internal reflections when polished. Due to no well-formed
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could not be determined. However, synthetic fangite exhibits
365:. The only available specimens of fangite are located in the
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Fangite is a deep red to maroon, transparent mineral with a
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586:-As polyhedral layer. This layer consists of Tl
413:or by substituting fluids that are Ti-rich for
373:, in honor of his significant contributions to
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541:The ideal chemical formula for fangite is Tl
48:introducing citations to additional sources
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38:Relevant discussion may be found on the
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453:and a density of 6.185 g/cm. Synthetic
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695:, b=10.855(9) Å, c=9.079(9) Å, z=4.
513:characteristics in hand specimen or
477:in the original specimen collected,
449:exhibits a hardness of 2-2.5 on the
393:Fangite was detected in an isolated
225:c = 9.079(9) Å; Z = 4
367:National Museum of Natural History
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505:from the blue to red end of the
31:relies largely or entirely on a
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349:first discovered in the Mercur
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357:The specimen was found in a
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199:2/m 2/m 2/m - Dipyramidal
681:Pittsburgh, Pennsylvania
223:, b = 10.855(9) Å
764:Orthorhombic minerals
677:powder diffractometer
668:X-ray crystallography
371:University of Alabama
173:Strunz classification
599:Chemical composition
44:improve this article
483:conchoidal fracture
451:Mohs hardness scale
425:Physical properties
355:Tooele County Utah.
353:deposit located in
495:optical properties
489:Optical properties
271:Vitreous, metallic
219:a = 8.894(8)
759:Thallium minerals
673:X-ray diffraction
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411:thallium sulfates
379:crystal chemistry
363:Oquirrh Mountains
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329:Relatively strong
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754:Arsenic minerals
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704:List of Minerals
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507:visible spectrum
361:in the southern
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248:Deep red, maroon
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230:Identification
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42:. Please help
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383:geostatistics
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100:December 2023
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61: –
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55:Find sources:
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33:single source
29:This article
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17:
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519:ore minerals
515:thin section
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236:Formula mass
188:Orthorhombic
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689:space group
656:99.2-101.8
555:tetrahedral
511:translucent
503:reflectance
399:sulfide ore
291:Transparent
287:Diaphaneity
205:Space group
748:Categories
709:References
645:15.5-15.8
634:9.10-9.20
623:74.6-76.8
567:octahedron
551:polyhedral
407:sphalerite
389:Occurrence
334:References
325:Dispersion
301:6.185 g/cm
254:Mohs scale
163:IMA symbol
70:newspapers
562:dipyramid
537:Structure
523:proustite
347:sulfosalt
309:Blue-gray
215:Unit cell
128:Sulfosalt
59:"Fangite"
40:talk page
699:See also
559:trigonal
499:fracture
479:cleavage
475:crystals
419:orpiment
319:Very low
257:hardness
240:816.3315
124:Category
687:with a
653:100.46
415:realgar
359:boulder
343:Fangite
297:Density
177:2.Ka.15
135:Formula
119:General
114:Fangite
84:scholar
650:Total
612:Range
403:pyrite
381:, and
281:Orange
277:Streak
267:Luster
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79:
72:
65:
57:
642:15.6
631:9.16
620:75.7
606:Oxide
421:.
345:is a
261:2-2.5
245:Color
91:JSTOR
77:books
609:wt%
351:gold
209:Pnma
63:news
578:AsS
545:AsS
529:AsS
525:(Ag
485:.
417:or
397:of
395:vug
46:by
750::
717:^
628:As
617:Th
591:Tl
574:Tl
461:As
455:Tl
441:As
435:Tl
385:.
377:,
167:Fg
150:As
144:Tl
693:Å
639:S
593:2
588:2
584:2
580:4
576:3
571:2
547:4
543:3
531:3
527:3
467:4
464:S
458:3
447:4
444:S
438:3
221:Å
156:4
153:S
147:3
102:)
98:(
88:·
81:·
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50:.
36:.
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