Durangite (original) (raw)

A valid IMA mineral species - grandfathered

About DurangiteHide

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Colour:

Light to dark orange-red, red; green; orange-yellow in artificial light.

Specific Gravity:

3.94 - 4.07

Crystal System:

Monoclinic

Name:

After the locality in the state of Durango, Mexico.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:1332:7

181766bf-7d7b-49b9-b3a5-3e428f6229c8

IMA Classification of DurangiteHide

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Approved, 'Grandfathered' (first described prior to 1959)

Type description reference:

Classification of DurangiteHide

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8.BH.10

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
H : With medium-sized and large cations, (OH,etc.):RO4 = 1:1

41.5.5.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
5 : (AB)2(XO4)Zq

22.1.31

22 : Phosphates, Arsenates or Vanadates with other Anions
1 : Phosphates, arsenates or vanadates with fluoride

Mineral SymbolsHide

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As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.

Pronunciation of DurangiteHide

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Pronunciation:

Physical Properties of DurangiteHide

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Colour:

Light to dark orange-red, red; green; orange-yellow in artificial light.

Comment:

Green colour exhibited by artificial material.

Cleavage:

Distinct/Good
On {110}, distinct.

Fracture:

Irregular/Uneven

Density:

3.94 - 4.07 g/cm3 (Measured) 3.616 g/cm3 (Calculated)

Comment:

Highest in dark-coloured, ferrian material.

Optical Data of DurangiteHide

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RI values:

_n_α = 1.634 _n_β = 1.673 _n_γ = 1.685

2V:

Measured: 45° , Calculated: 56°

δ = 0.051

Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.

Comments:

X = ^c -25° = Orange-yellow
Y = Pale orange-yellow
Z = b = Nearly colourless

Chemistry of DurangiteHide

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Mindat Formula:

NaAl(AsO4)F

Crystallography of DurangiteHide

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Crystal System:

Monoclinic

Class (H-M):

2/m - Prismatic

Cell Parameters:

a = 6.5789(5) Å, b = 8.5071(6) Å, c = 7.0212(5) Å
β = 115.447(4)°

Ratio:

a:b:c = 0.773 : 1 : 0.825

Morphology:

Crystal habit is oblique pyramidal with {111} and {110} dominant. Faces commonly dull and rough. Artificial crystals are prismatic [101], and rarely tabular.

Twinning:

On {001} common as interopenetration twins (artificial crystals).

Crystal StructureHide

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X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of DurangiteHide

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General Appearance of Type Material:

Rhombic orange-red crystals.

Place of Conservation of Type Material:

Yale University, New Haven, Connecticut, USA, 3.586, 3.3036, 3.3037.

Associated Minerals at Type Locality:

Reference:

Brush, G.J. (1869) On durangite, a fluo-arsenate from Durango in Mexico. American Journal of Science and Arts: 98: 179-182.

Other Language Names for DurangiteHide

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Relationship of Durangite to other SpeciesHide

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Other Members of this group:

Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Other InformationHide

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Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for DurangiteHide

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References for DurangiteHide

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Reference List:

**Palache, Charles, Berman, Harry, Frondel, Clifford (1951) The System of Mineralogy (7th ed.) Vol. 2 - Halides, Nitrates, Borates, Carbonates, Sulfates, Phosphates, Arsenates, Tungstates, Molybdates, Ect. John Wiley and Sons, New York.**pp.829-831

Downs, Gordon W., Yang, Betty N., Thompson, Richard M., Wenz, Michelle D., Andrade, Marcelo B. (2012) Redetermination of durangite, NaAl(AsO4)F. Acta Crystallographica Section E Structure Reports Online, 68 (11) 86-87 doi:10.1107/s160053681204384x

Localities for DurangiteHide

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This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

Locality ListHide

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- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.