Hedyphane

A valid IMA mineral species - grandfathered

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Hedyphane, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Hedyphane

San Pietro Mine, Monte Tamara mining area, Nuxis, South Sardinia Province, Sardinia, Italy

Hedyphane, etc.

Puttapa, Pastoral Unincorporated Area, South Australia, Australia

Hedyphane, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Hedyphane

San Pietro Mine, Monte Tamara mining area, Nuxis, South Sardinia Province, Sardinia, Italy

Hedyphane, etc.

Puttapa, Pastoral Unincorporated Area, South Australia, Australia

Hedyphane, etc.

Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Hedyphane

San Pietro Mine, Monte Tamara mining area, Nuxis, South Sardinia Province, Sardinia, Italy

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About HedyphaneHide

Formula:

Ca₂Pb₃(AsO₄)₃Cl

Colour:

White, yellowish white, buff, bluish; colourless in transmitted light.

Lustre:

Resinous, Greasy

Hardness:

4 - 5

Specific Gravity:

5.82

Crystal System:

Hexagonal

Member of:

Hedyphane Group > Apatite Supergroup

Name:

First described from Långban, Sweden and named in 1830 by Johann Friedrich August Breithaupt from the Greek ηδύς for "sweet" or "beautiful" and φαίνεσθαι, "to appear", in allusion to the typical appearance and luster of specimens. Redefined in 1926 by William Foshag and Robert Gage and then redefined by Roland C. Rouse, Pete J. Dunn, and Donald R. Peacor (1984).

Type Locality:

ⓘ Långban Mine, Långban Ore District, Filipstad, Värmland County, Sweden

Isostructural with:

Phosphohedyphane

A relatively rare mineral of the Apatite Supergroup found in metamorphosed manganese deposits.
The Pb₃Ca₂ analogue of Turneaureite and Mimetite. The arsenate analogue of Phosphohedyphane. Also the chlorine analogue of hydroxylhedyphane.
Hedyphane-Mimetite Series

Pb and Ca atoms are ordered on two different cation sites (M1 and M2) in the crystal structure.
Formerly thought to be a Ca-bearing variety of mimetite.

Flat, tabular habit

Semispherulitic aggregates

Prismatic, needlelike habit

Massive

In MW UV light: pale yellow

Flat, tabular habit

Semispherulitic aggregates

Prismatic, needlelike habit

Massive

In MW UV light: pale yellow

Flat, tabular habit

Semispherulitic aggregates

Prismatic, needlelike habit

Massive

In MW UV light: pale yellow

Unique IdentifiersHide

Mindat ID:

1844

Long-form identifier:

mindat:1:1:1844:5

IMA Classification of HedyphaneHide

IMA status:

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

IMA Formula:

Ca₂Pb²⁺₃(As⁵⁺O₄)₃Cl

First published:

1830

Type description reference:

Breithaupt, [J.F.] August (1830) Bestimmung neuer mineral-specien, hedyphan. Journal für Chemie und Physik, 308-316

Classification of HedyphaneHide

Strunz-mindat (2026):

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

Dana 8th ed.:

41.8.2.1

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

Hey's CIM Ref.:

22.2.17

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

Mineral SymbolsHide

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

Symbol	Source	Reference for Standard
Hdp	IMA–CNMNC	Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43

Physical Properties of HedyphaneHide

Lustre:

Resinous, Greasy

Comment:

Bright lustre

Colour:

White, yellowish white, buff, bluish; colourless in transmitted light.

Hardness:

4 - 5 on