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Eyselite

Formula:
Fe
3+
 
Ge
4+
3
O
 
7
(OH)
System:OrthorhombicColour:Dirty brown-yellow ...
Name:The mineral’s name honors the late Walter H. Eysel, Professor of Crystallography, Ruprecht-Karls-Universität, Heidelberg, Germany, for his contributions to the study of germanates and for his numerous contributions to the Powder Diffraction File.

This page provides mineralogical data about Eyselite.

Classification of Eyselite

IMA status:Approved 2003
Nickel-Strunz 10th (pending) edition ID:4.DM.20

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
D : Metal: Oxygen = 1:2 and similar
M : With large (+- medium-sized) cations; unclassified
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Type Occurrence of Eyselite

Type Locality:Tsumeb Mine (Tsumcorp Mine), Tsumeb, Otjikoto (Oshikoto) Region, Namibia
General Appearance of Type Material:Individual subhedral to (rare) euhedral crystals are platy to very thin prismatic, elongate [001], with a length-to-width ratio of approximately 3:1 and not exceeding 20 µm in maximum length. Typical crystals are 20 × 14 × 1 µm in size. Forms are {100} ma
Geological Setting of type material:Very fine-grained aggregates in vugs of massive renierite – germanite – tennantite ore
Associated Minerals at type locality:
TennantiteRenieriteGermanite

Physical Properties of Eyselite

Diaphaneity (Transparency):Transparent, Translucent, Translucent on thin edges, Opaque
Colour:Dirty brown-yellow (aggregates) to yellow-tan (crystals)
Streak:Brownish-yellow
Density (calculated):3.639 g/cm3

Crystallography of Eyselite

Crystal System:Orthorhombic
Cell Parameters:a = 8.302Å, b = 9.718Å, c = 4.527Å
Ratio:a:b:c = 0.854 : 1 : 0.466
Unit Cell Volume:V 365.2 ų
Z:2
X-Ray Powder Diffraction:
d-spacingIntensity
4.105(40)
3.681(100)
3.121(60b)
121)(
2.921(100)
2.512(40)
2.403(90)
1.646(80)

Optical Data of Eyselite

Type:Biaxial (+)

Chemical Properties of Eyselite

Formula:
Fe
3+
 
Ge
4+
3
O
 
7
(OH)
All elements listed in formula:Fe, Ge, H, O
Analyical Data:The infrared-absorption spectrum shows bands for structural (OH). A micro-XAS study shows that all the Fe is trivalent, and the Ge atoms are probably in octahedral coordination.
CaO (0.06)
Fe2O3 (18.54)
Ga2O3 (1.01)
GeO2 (77.75)
H2O (2.64) (by difference)
total 100.00 wt.%
Empirical Formula:
(Fe
3+
0.93
Ga
3+
0.04
)
 
Σ0.97
Ge
4+
2.98
O
 
6.90
(OH)
 
1.17

Relationship of Eyselite to other Species

Related Minerals - Nickel-Strunz Grouping):

- +
4.DM.05Rankamaite
(Na,K,Pb,Li)
 
3
(Ta,Nb,Al)
 
11
(O,OH)
 
30
4.DM.05Sosedkoite
(K,Na)
 
5
Al
 
2
(Ta,Nb)
 
22
O
 
60
4.DM.15Cesplumtantite
(Cs,Na)
 
2
(Pb,Sb
3+
 
)
 
3
Ta
 
8
O
 
24
4.DM.25Kuranakhite
PbMn
4+
 
Te
6+
 
O
 
6

Other Names for Eyselite

Synonyms:
IMA2003-052
Other Languages:
German:Eyselit

Other Information

Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for Eyselite

Reference List:Roberts, A.C., Seward, T.M., Reusser, E., Carpenter, G.J.C., Grice, J.D., Clark, S.M., and Marcus. M.A. (2004): Eyselite, Fe3+Ge4+3O7(OH), a new mineral species from Tsumeb, Namibia. Canadian Mineralogist, 42, 1771-1776.

Articles/Blogs about Eyselite

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    Localities for Eyselite

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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Namibia
     
    • Otjikoto (Oshikoto) Region
      • Tsumeb
    		The Canadian Mineralogist, 42, 1771-1776.
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