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Hansesmarkite

This page kindly sponsored by Peter Andresen
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About HansesmarkiteHide

The Norwegian priest and mineralogist Hans Morten Thrane Esmark (1801-1882)
Formula:
Ca2Mn2Nb6O19·20H2O
Colour:
Faint yellow; yellow
Hardness:
2 - 2½
Specific Gravity:
2.74 (Calculated)
Crystal System:
Triclinic
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.


Classification of HansesmarkiteHide

Approved
Approval Year:
2015
First Published:
2017

Physical Properties of HansesmarkiteHide

Colour:
Faint yellow; yellow
Streak:
Very pale yellow
Hardness:
2 - 2½ on Mohs scale
Comment:
Not measured, based on similarity to peterandresenite
Tenacity:
Brittle
Cleavage:
Distinct/Good
on {011} and {01-1}.
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

Type:
Biaxial (+)
RI values:
nα = 1.683(2) nβ = 1.698(2) nγ = 1.745(3)
2V:
Measured: 60.7° (6), Calculated: 60.3°
Max Birefringence:
δ = 0.062
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
moderate (r>v)
Comments:
X (~colourless) < Y (pale yellow) << Z (orange-yellow)
Comments:
Orientation: X^c=20º, Y^b=16º, Z^a=5º

Chemical Properties of HansesmarkiteHide

Formula:
Ca2Mn2Nb6O19·20H2O
IMA Formula:
Ca2Mn2Nb6O19 · 20H2O
Common Impurities:
Fe

Crystallography of HansesmarkiteHide

Crystal System:
Triclinic
Class (H-M):
1 - Pedial
Space Group:
P1
Setting:
P1
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}, {01-1}, {10-1}, {1-11}, {1-10}, {1-22}, {12-3} and {210}.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
9.282(36)
8.610(100)
7.108(14)
5.412(12)
3.257(30)
3.058(18)
2.715(17)
2.628(12)

Occurrences of HansesmarkiteHide

Paragenetic Mode(s):

Type Occurrence of HansesmarkiteHide

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:
Nb2O564 %
MnO10.2 %
CaO8.6 %
FeO0.6 %
Na2O0.04 %
K2O0.02 %
H2O28.94 %
Total:112.4 %
Geological Setting of Type Material:
Syenite pegmatite in a larvikite quarry
Associated Minerals at Type Locality:

Synonyms of HansesmarkiteHide

Fluorescence of HansesmarkiteHide

None luminescence under longwave or shortwave ultraviolet light

Other InformationHide

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.

References for HansesmarkiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Friis, H., Weller, M.T. and Kampf, A.R. (2015) IMA 2015-067. CNMNC Newsletter No. 28, December 2015, page1860; Mineralogical Magazine, 79, 1859–1864
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.

Internet Links for HansesmarkiteHide

Localities for HansesmarkiteHide

ⓘ - Click for 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 (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
Norway (TL)
 
  • Vestfold
    • Larvik
      • Tvedalen
        • Tuften (Tuften 1 Quarry; Tuften 2 Quarry)
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.
Mineral and/or Locality  
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