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Gunterite

This page kindly sponsored by C2/m Mineralogy
Mickey E. Gunter
Formula:
Na4(H2V10O28) · 22H2O
Colour:
orange-yellow
Lustre:
Sub-Adamantine
Hardness:
1
Specific Gravity:
2.398 (Calculated)
Crystal System:
Monoclinic
Name:
Named in honor of Dr. Mickey Eugene Gunter (b. 1953), Professor of Mineralogy at the University of Idaho. Professor Gunter is particularly well known for his studies in optical mineralogy and the mineralogy of asbestos minerals.
This page provides mineralogical data about Gunterite.


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Classification of GunteriteHide

Approved
Approval Year:
2011

Physical Properties of GunteriteHide

Sub-Adamantine
Transparency:
Transparent, Translucent
Colour:
orange-yellow
Streak:
yellow
Hardness:
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
none
Fracture:
Irregular/Uneven
Density:
2.398 g/cm3 (Calculated)

Optical Data of GunteriteHide

Type:
Biaxial (+)
RI values:
nα = 1.735(5) nβ = 1.770(5) nγ = 1.825(5)
2V:
Measured: 78°
Max Birefringence:
δ = 0.090
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Very High
Dispersion:
v < r, strong, parallel
Pleochroism:
Visible
Comments:
X yellow, Y orange, Z yellow; Y > X > Z.
Comments:
γ calculated (index fluids decomposed mineral)

Chemical Properties of GunteriteHide

Formula:
Na4(H2V10O28) · 22H2O
IMA Formula:
Na4(H2O)16(H2V10O28) · 6H2O

Crystallography of GunteriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/m
Setting:
C2/m
Cell Parameters:
a = 19.848(2) Å, b = 10.1889(11) Å, c = 13.1184(15) Å
β = 130.187(9)°
Ratio:
a:b:c = 1.948 : 1 : 1.288
Unit Cell V:
2,026.68 ų (Calculated from Unit Cell)
Z:
2

Type Occurrence of GunteriteHide

General Appearance of Type Material:
tabular on {001} and generally stacked into elongate curved multiple crystals up to 0.5 mm in maximum dimension. The crystals typically exhibit warping and, in some cases, skeletal growth features.
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County under catalogue numbers 63506 and 63507.
Geological Setting of Type Material:
efflorescences on the sandstone walls of the mine workings and in fractures in the sandstone forming from the oxidation of montroseite–corvusite assemblages.
Associated Minerals at Type Locality:

Synonyms of GunteriteHide

Fluorescence of GunteriteHide

Other InformationHide

Notes:
soluble in water at room temperature.
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 GunteriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Kampf, A., Hughes, J., Marty, J., and Nash, B. (2011). Gunterite. IMA 2011-001. CNMNC Newsletter, Mineralogical Magazine, 75. [see http://www.mindat.org/forum.php?read,14,234271,235444#msg-235444]
Kampf, A. R., Hughes, J. M., Marty, J., & Nash, B. (2011). Gunterite, Na4 (H2O) 16 (H2V10O28)· 6H2O, a New Mineral Species with a Doubly-protonated Decavanadate Polyanion: Crystal Structure and Descriptive Mineralogy. The Canadian Mineralogist, 49(5), 1243-1251.

Internet Links for GunteriteHide

Localities for GunteriteHide

ⓘ - 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.
USA (TL)
 
  • Colorado
    • San Miguel Co.
      • Slick Rock District
Kampf, A. R., Hughes, J. M., Marty, J., & Nash, B. (2011). Gunterite, Na4 (H2O) 16 (H2V10O28)· 6H2O, a New Mineral Species with a Doubly-protonated Decavanadate Polyanion: Crystal Structure and Descriptive Mineralogy. The Canadian Mineralogist, 49(5), 1243-1251.
Mineral and/or Locality  
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