Hansesmarkite (original) (raw)

A valid IMA mineral species

About HansesmarkiteHide

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Formula:

Ca2Mn2Nb6O19 · 20H2O

Colour:

Faint yellow; yellow

Lustre:

Vitreous, Resinous

Specific Gravity:

2.74 (Calculated)

Name:

Named after the Norwegian priest and mineralogist Hans Morten Thrane Esmark (21 August 1801 – 24 April 1882). He was a chaplain (parish priest) in Eidanger and the town of Brevik situated by the Langesundsfjord west of the Larvik Plutonic Complex (LPC), Norway. He discovered several new mineral species as aegirine, leucophanite and thorite. The now descredited esmarkite (of Berzelius), showed to be a weathered cordierite, is also named after him.

New structure type.
Hansesmarkite is extremely prone to dehydration.

The third naturally occurring hexaniobate. Chemically similar to the hexaniobate peterandresenite; further similarity to heteropolyniobates menezesite and aspedamite. As in peterandresenite, the structure is based on 6 edge-sharing Nb-octahedra forming the Lindqvist ion. These complex ions are connected via Mn octahedra thus forming rods along [100]; the space between the rods holds Ca ions. Hydrogen bonds are also present.

Unique IdentifiersHide

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Long-form identifier:

mindat:1:1:46880:2

98418f6a-edd8-4ac4-af10-4b1e0ae79126

IMA Classification of HansesmarkiteHide

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Type description reference:

Classification of HansesmarkiteHide

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7.GB.60

7 : SULFATES (selenates, tellurates, chromates, molybdates, wolframates)
G : Molybdates, Wolframates and Niobates
B : With additional anions and/or H2O

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 HansesmarkiteHide

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Colour:

Faint yellow; yellow

Comment:

Not measured, based on similarity to peterandresenite

Cleavage:

Distinct/Good
good on {011} and {011}.

Comment:

Fracture described as curved in type description.

Density:

2.74 g/cm3 (Calculated)

Comment:

Calulated on basis of the empirical formula.

Optical Data of HansesmarkiteHide

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RI values:

_n_α = 1.683(2) _n_β = 1.698(2) _n_γ = 1.745(3)

2V:

Measured: 60.7° (6), Calculated: 60.3°

δ = 0.062

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

Dispersion:

moderate (r>v)

Comments:

X (~colourless) < Y (pale yellow) << Z (orange-yellow)

Comments:

Orientation: X^c=20º, Y^b=16º, Z^a=5º

Chemistry of HansesmarkiteHide

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Mindat Formula:

Ca2Mn2Nb6O19 · 20H2O

Crystallography of HansesmarkiteHide

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Cell Parameters:

a = 9.081(4) Å, b = 9.982(8) Å, c = 10.60(1) Å
α = 111.07(8)°, β = 101.15(6)°, γ = 99.39(5)°

Ratio:

a:b:c = 0.91 : 1 : 1.062

Unit Cell V:

850.81 ų (Calculated from Unit Cell)

Morphology:

Patches, rarely as elongated tablets up to 0.3 mm long within the patches. Elongated on [100]. Forms observed: {100}, {010}, {011}, {011}, {101}, {111}, {110}, {122}, {123} and {210}.

X-Ray Powder DiffractionHide

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Powder Diffraction Data:

Geological EnvironmentHide

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Type Occurrence of HansesmarkiteHide

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General Appearance of Type Material:

Crystals up, to 0.3 mm; also thin coatings in patches on gonnardite

Place of Conservation of Type Material:

Cotype material is deposited in the collections of the Natural History Museum, University of Oslo, Norway, catalogue numbers 43584, 43585 and 43586, and the Mineral Sciences Department, Natural History Museum of Los Angeles, USA

Empirical Formula of Type Material:

(Ca1.93Na0.02K0.01)Σ1.96(Mn1.79Fe0.11)Σ1.90Nb6O18.84·20H2O

Chemical Analysis of Type Material:

Geological Setting of Type Material:

Syenite pegmatite in a larvikite quarry

Associated Minerals at Type Locality:

Reference:

Friis, H., Weller, M.T., Kampf, A.R. (2016): Hansesmarkite, Ca2Mn2Nb6O19·20H2O, a new hexaniobate from a syenite pegmatite in the Larvik Plutonic Complex, southern Norway. Mineralogical Magazine: 81: 543-554.

Synonyms of HansesmarkiteHide

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Common AssociatesHide

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Associated Minerals Based on Photo Data:

Related Minerals - Strunz-mindat GroupingHide

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Fluorescence of HansesmarkiteHide

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None luminescence under longwave or shortwave ultraviolet light

Other InformationHide

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Notes:

Hansesmarkite readily dehydrates in a vacuum.

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 HansesmarkiteHide

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References for HansesmarkiteHide

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Localities for HansesmarkiteHide

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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.