Alforsite (original) (raw)

A valid IMA mineral species

About AlforsiteHide

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Lustre:

Vitreous, Sub-Vitreous

Specific Gravity:

4.80 (Calculated)

Name:

Named by N. G. Newberry, Eric J. Essene, and Donald R. Peacor in honor of John T. Alfors [November 24, 1930 Reedley, CA, USA - December 27, 2005 Davis, CA], geologist and systematic mineralogist with the California geological Survey, USA.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:112:0

fa2c17bb-68b6-4439-935a-459f81bb4815

IMA Classification of AlforsiteHide

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Classification of AlforsiteHide

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8.BN.05

8 : PHOSPHATES, ARSENATES, VANADATES
B : Phosphates, etc., with additional anions, without H2O
N : With only large cations, (OH, etc.):RO4 = 0.33:1

41.8.5.2

41 : ANHYDROUS PHOSPHATES, ETC.CONTAINING HYDROXYL OR HALOGEN
8 : A5(XO4)3Zq

22.2.7

22 : Phosphates, Arsenates or Vanadates with other Anions
2 : Phosphates, arsenates or vanadates with chloride

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.

Physical Properties of AlforsiteHide

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Density:

4.80 g/cm3 (Calculated)

Optical Data of AlforsiteHide

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RI values:

_n_ω = 1.700 _n_ε = 1.701

δ = 0.001

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

Optical Extinction:

Parallel

Pleochroism:

Non-pleochroic

Chemistry of AlforsiteHide

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Mindat Formula:

Ba5(PO4)3Cl

Crystallography of AlforsiteHide

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Class (H-M):

6/m - Dipyramidal

Cell Parameters:

a = 10.25 Å, c = 7.64 Å

Unit Cell V:

695.14 ų (Calculated from Unit Cell)

Morphology:

Crystals are subhedral, to 0.2 mm, in very fine-grained masses.

Crystal StructureHide

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0009691	Alforsite	Hata M, Marumo F, Iwai S, Aoki H (1979) Structure of barium chlorapatite Acta Crystallographica B35 2382-2384		1979	0	293

CIF Raw Data - click here to close

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Comments:

Synthetic material

Geological EnvironmentHide

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Geological Setting:

In lenses and bands of barium silicate metasediments developed under hornblende-pyroxene hornfels facies near the contact with granite or granodiorite.

Type Occurrence of AlforsiteHide

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Place of Conservation of Type Material:

National Museum of Natural History, Washington, D.C., USA, 147511.

Geological Setting of Type Material:

Contact metamorphosed barium-rich metasediments

Associated Minerals at Type Locality:

Synonyms of AlforsiteHide

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Other Language Names for AlforsiteHide

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Simplified Chinese:氯磷钡石

Traditional Chinese:氯磷鋇石

Relationship of Alforsite 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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Fluorescence of AlforsiteHide

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Not fluorescent, but bright purple/violet cathodluminescence

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 AlforsiteHide

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References for AlforsiteHide

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Localities for AlforsiteHide

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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.