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Magnolite

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Mining map of the Magnolia District

Magnolia District, Boulder Co., Colorado, USA
Formula:
(Hg2+)(Te4+O3)
System:
Orthorhombic
Colour:
Colorless, creamy white; ...
Lustre:
Sub-Adamantine, Sub-Vitreous, Waxy, Greasy
Name:
Named in 1877 by Frederick Genthite for the type location in the Magnolia district. Re-investigated by Roberts et al. (1989).
This page provides mineralogical data about Magnolite.

Classification of Magnolite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
4.JK.60

4 : OXIDES (Hydroxides, V[5,6] vanadates, arsenites, antimonites, bismuthites, sulfites, selenites, tellurites, iodates)
J : Arsenites, antimonites, bismuthites, sulfites, selenites, tellurites; iodates
K : Tellurites without additional anions, without H2O
Dana 7th ed.:
34.1.8.1
34.1.7.1

34 : SELENITES, TELLURITES AND SULFITES
1 : A(XO3)
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http://www.mindat.org/min-2542.html
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Type Occurrence of Magnolite

General Appearance of Type Material:
Colorless to needles or white laths on goethite on coloradoite ore.
Place of Conservation of Type Material:
Smithsonian Museum, Washington DC 165455
Year of Discovery:
1877
Geological Setting of Type Material:
A late alteration product or the weathdring zone of complex polymetallic mineral deposits.
Associated Minerals at Type Locality:

Physical Properties of Magnolite

Sub-Adamantine, Sub-Vitreous, Waxy, Greasy
Diaphaneity (Transparency):
Transparent
Comment:
May be in silky in aggregates.
Colour:
Colorless, creamy white; also pale yellow green (Mountain Lion Mine).
Streak:
Colorless, also light brown (Mountain Lion Mine)
Comment:
Soft
Tenacity:
Brittle
Cleavage:
Perfect
Perfect on {001}
Good perpendicular to {001}
Density:
8.12 g/cm3 (Calculated)

Crystallography of Magnolite

Crystal System:
Orthorhombic
Class (H-M):
mm2 - Pyramidal
Cell Parameters:
a = 5.948(1) Å, b = 10.580(2) Å, c = 3.745(1) Å
Ratio:
a:b:c = 0.562 : 1 : 0.354
Unit Cell Volume:
V 235.67 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Bladed crystals, tufted aggregates.
Comment:
Roberts et al. (1989)
X-Ray Powder Diffraction Data:
d-spacingIntensity
5.25 (50)
3.95 (70)
3.74 (40)
3.17 (30)
3.043 (100)
2.587 (50)
1.986 (40)
1.944 (35)
Comments:
Roberts et al. (1989)

Optical Data of Magnolite

Type:
Biaxial (+)
Optical Extinction:
Parallel. Y=a, X=b,Z=c
Pleochroism:
Non-pleochroic
Comments:
n=>2, 2V => 45

Chemical Properties of Magnolite

Formula:
(Hg2+)(Te4+O3)
Essential elements:
All elements listed in formula:
Empirical Formula:
Hg21+TeO3

Relationship of Magnolite to other Species

4.JK.05WinstanleyiteTiTe34+O8
4.JK.05Walfordite(Fe3+,Te6+)Te34+O8
4.JK.10Spiroffite(Mn,Zn)2Te34+O8
4.JK.10ZincospiroffiteZn2Te34+O8
4.JK.15BalyakiniteCu(TeO3)
4.JK.20RajiteCu(Te24+O5)
4.JK.25CarlfriesiteCaTe24+Te6+O8
4.JK.30Denningite(Mn2+,Ca,Zn)Te24+O5
4.JK.35ChekhovichiteBi2Te44+O11
4.JK.40SmirniteBi2Te4+O5
4.JK.45Choloalite(Cu,Sb)3(Pb,Ca)3(TeO3)6Cl
4.JK.50FairbankitePb(TeO3)
4.JK.55PlumbotelluritePb(TeO3)
4.JK.65MoctezumitePb(UO2)(TeO3)2
4.JK.70Schmitterite(UO2)(TeO3)
4.JK.75Cliffordite(UO2)Te34+O7

Other Names for Magnolite

Name in Other Languages:
German:Magnolit
Spanish:Magnolita

Other Information

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 Magnolite

Reference List:
Genth, F. A. (1878): On some tellurium and vanadium minerals. Proceedings of the American Philosophical Society 17, 113-123.

Roberts, A.C., Bonardi, M., Grice, J.D., Ercit, T.S., and Pinch, W.W. (1989): A restudy of magnolite, Hg1+2Te4+03, from Colorado. Canadian Mineralogist 27, 129-131.

Grice, J.D. (1989): The crystal structure of magnolite, Hg1+2Te4+03. Canadian Mineralogist 27, 133-136.

American Mineralogist (1990): 75: 437.

Internet Links for Magnolite

Localities for Magnolite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? 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.
USA (TL)
 
  • Colorado
    • Boulder Co.
      • Magnolia District
Minerals of Colorado (1997) Eckel, E. B.
Minerals of Colorado (1997) Eckel, E. B.
    • La Plata Co.
      • La Plata District (California District)
M.E. Ciriotti, 2006, probed
Mineral and/or Locality  
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