Armenite (original) (raw)

A valid IMA mineral species - grandfathered

About ArmeniteHide

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Formula:

Ba(H2O)2Ca2Al3[Al3Si9O30]

Colour:

Colourless, white, green

Crystal System:

Orthorhombic

Name:

Named after the type locality, the Armen Mine, Kongsberg, Norway.

The type specimen was collected already in 1877 by cand. min. O. A. Corneliussen. He labelled the sample as "Epidote?". It was kept in the collection of the University of Oslo until February 1939 when it was rediscovered by Henrich Neumann, who also recognized it as a new mineral.

This page provides mineralogical data about Armenite.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:343:8

ef564e74-ba0c-4cbe-b451-9316843ffc3e

IMA Classification of ArmeniteHide

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

IMA Formula:

BaCa2(Al6Si9)O30 · 2H2O

Classification of ArmeniteHide

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9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)

63.2.1b.1

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)

16.12.12

16 : Silicates Containing Aluminum and other Metals
12 : Aluminosilicates of Sr, Ba and Zn

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 ArmeniteHide

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Pronunciation:

Physical Properties of ArmeniteHide

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Colour:

Colourless, white, green

Cleavage:

Perfect
Perfect prismatic. One distinct pinacoidal.

Parting:

Along sector boundaries.

Density:

2.77 g/cm3 (Measured)

Optical Data of ArmeniteHide

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RI values:

_n_α = 1.550 _n_β = 1.552 _n_γ = 1.556

2V:

Measured: 59° to 60°, Calculated: 72°

δ = 0.006

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

Optical Extinction:

X = c; Z = b.

Chemistry of ArmeniteHide

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Mindat Formula:

Ba(H2O)2Ca2Al3[Al3Si9O30]

Common Impurities:

Sr,Na,K

Crystallography of ArmeniteHide

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Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 13.874(2) Å, b = 18.660(2) Å, c = 10.697(1) Å

Ratio:

a:b:c = 0.744 : 1 : 0.573

Unit Cell V:

2,769.33 ų (Calculated from Unit Cell)

Morphology:

Prismatic pseudohexagonal crystals.

Twinning:

The pseudohexagonal form is due to twinning along an axis parallel to the optic direction a.

Comment:

Space group is Pnna. Symmetry reduction is due to partial ordering of Si and Al. Ordering of water gives primitive orthorhombic unit cell.

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 ArmeniteHide

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Place of Conservation of Type Material:

National School of Mines, Paris, France; The Natural History Museum, London, England, 1947,290.

Geological Setting of Type Material:

A silver-bearing calcite-vein, Kongsberg, Norway.

Associated Minerals at Type Locality:

Other Language Names for ArmeniteHide

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Relationship of Armenite 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 ArmeniteHide

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References for ArmeniteHide

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Reference List:

Jambor, J.L., Bladh, K.W., Ercit, T.S., Grice, J.D., Grew, E.S. (1988) New mineral names. American Mineralogist, 73, 927-935.

Localities for ArmeniteHide

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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.

Australia
New South Wales Yancowinna Co. Broken Hill district ⓘ Broken Hill	Birch BH Book +1 other reference
ⓘ The Piggery	Mason (1987)
ⓘ Purnamoota (Purnamoota Station)	Brian Mason (1987)
Canada
Ontario Kenora District Root Lake pegmatite group Root Lake Area ⓘ McCombe pegmatites	Tindle et al. (2005)
Thunder Bay District Bomby Township ⓘ Hemlo gold deposit	Pan et al. (1992) +1 other reference
Québec Abitibi-Témiscamingue Témiscamingue RCM ⓘ Rémigny armenite occurrence	the second occurrence of armenite. The Canadian Mineralogist (3) +3 other references
Cuba
Villa Clara Province ⓘ San Fernando mine	Torró et al. (2016)
Czech Republic
Olomouc Region Šumperk District Ruda nad Moravou ⓘ Žd'ár pegmatite	Novak et al. (2010) +2 other references
Pardubice Region Pardubice District ⓘ Chvaletice	Mineralogical Society of America - ...
Eswatini
Hhohho Region ⓘ Londozi mine	Roerdink et al. (2016)
Italy
Piedmont Verbano-Cusio-Ossola Province Mergozzo Candoglia ⓘ Candoglia marble quarries	Peyronel Pagliani (1958) +2 other references
Sardinia South Sardinia Province Fluminimaggiore ⓘ Su Zurfuru Mine	Stara et al. (1994)
Narcao Rosas Mine Complex (Rosas Mine) ⓘ Mitza Sermentus Mine (Mitza Sermentus stope)	Cocco et al. (2022)
Norway
Buskerud Kongsberg ⓘ Bratteskjerpet Mine	Bancroft et al. (2001)
Overberget Mining Field ⓘ Armen Mine (TL)	Neumann (1941)
Portugal
Bragança Freixo de Espada à Cinta Poiares ⓘ Ribeira do Mosteiro Mines	L. Miguel Gaspar and Carlos M. C. Inverno (2000)
Guarda Figueira de Castelo Rodrigo Escalhão ⓘ Riba de Alva Mine	Gaspar et al. (2000)
Russia
Murmansk Oblast ⓘ Lovozero Massif	...
Sverdlovsk Oblast Serovsky District Turya river Tur'insk ⓘ Vorontsovskoe deposit (Vorontsovsk gold deposit; Vorontsovka deposit)	Kasatkin et al. (2018) +1 other reference
South Korea
Daejeon Daejeon-gun ⓘ Hasodong	Gi Young Jeong (2006)
Gyeonggi Province ⓘ Deokpyeong area	Cheong et al. (2003)
Spain
Catalonia Tarragona Conca de Barberà Vimbodí i Poblet ⓘ Bosc de Poblet	C. Canet et al.
Sweden
Dalarna County Säter Öster Silvberg mining district ⓘ Gumsberg project	Makvandi et al. (2024)
Switzerland
Valais Brig Ried-Brig Ganter valley Wasen Alp ⓘ Isenwegg	Moore (2001) +1 other reference
UK
ⓘ Scotland	Tindle (2008)
Aberdeenshire Braemar ⓘ Coir Loch Kander	Fortey et al. (1991) +2 other references
USA
Washington King County Snoqualmie Mining District ⓘ North Bend	Mineralogical Society of America - ... +2 other references