Yangite
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About Yangite
Formula:
PbMnSi3O8•H2O
Colour:
colorless to pale brown (in transmitted light)
Lustre:
Vitreous
Hardness:
5
Specific Gravity:
4.14
Crystal System:
Triclinic
Name:
Named in honor of Hexiong Yang, Department of Geosciences, University of Arizona, Tucson, an expert on chain silicates. Also for his involvement with the RRUFF project’s goal to characterize all known minerals chemically, structurally, and spectrographically.
New chain silicate with the two-connected double chains. First chain silicate with two-connected double chains, structurally related to hypothetical triclinic Ca2Si3O8·2H2O phase proposed by Merlino and Bonaccorsi (2008), and thus may be treated as a structural derivative of okenite.
The structure comprises double wollastonite SiO4 tetrahedral chains || [010]; the chains are joined with ribbons of Mn- and Pb-bearing polyhedra.
The structure comprises double wollastonite SiO4 tetrahedral chains || [010]; the chains are joined with ribbons of Mn- and Pb-bearing polyhedra.
Classification of Yangite
Physical Properties of Yangite
Vitreous
Transparency:
Transparent
Colour:
colorless to pale brown (in transmitted light)
Comment:
in transmitted light
Streak:
white
Hardness:
5 on Mohs scale
Comment:
ca. 5
Tenacity:
Sectile
Cleavage:
Perfect
on {101}
on {101}
Parting:
not observed
Density:
4.14(3) g/cm3 (Measured) 4.16 g/cm3 (Calculated)
Optical Data of Yangite
Type:
Biaxial (-)
RI values:
nα = 1.690(1) nβ = 1.699(1) nγ = 1.705(1)
2V:
Measured: 77° (2)
Max Birefringence:
δ = 0.015
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
and does not take into account mineral colouration.
Surface Relief:
High
Comments:
Y = b, Z ^ c = 11°
Chemical Properties of Yangite
Formula:
PbMnSi3O8•H2O
IMA Formula:
PbMnSi3O8 · H2O
Crystallography of Yangite
Crystal System:
Triclinic
Class (H-M):
1 - Pinacoidal
Space Group:
P1
Cell Parameters:
a = 9.6015(9) Å, b = 7.2712(7) Å, c = 7.9833(8) Å
α = 105.910(4)°, β = 118.229(4)°, γ = 109.938(5)°
α = 105.910(4)°, β = 118.229(4)°, γ = 109.938(5)°
Ratio:
a:b:c = 1.32 : 1 : 1.098
Unit Cell V:
392.69 ų
Twinning:
not observed
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 7.379 | (100) |
| 6.648 | (48) |
| 3.717 | (44) |
| 3.517 | (38) |
| 2.992 | (38) |
| 2.949 | (40) |
| 2.917 | (65) |
| 2.907 | (55) |
Comments:
From Type Description.
Type Occurrence of Yangite
General Appearance of Type Material:
bladed or platy (when broken), elongated along [010]
Place of Conservation of Type Material:
Mineral Museum of the University of Arizona, Tucson, Arizona, USA, catalogue number 19341, and the Smithsonian Institution, Washington DC, USA, catalogue number 175983
Geological Setting of Type Material:
Kombat mine, Otavi Valley, Namibia
Associated Minerals at Type Locality:
Synonyms of Yangite
Other Information
Notes:
insoluble in water, acetone, or hydrochloric acid
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 Yangite
Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Pinch, W.W., Downs, R.T., Evans, S.H., Megaw, L., Bloch, E.M. (2013) Yangite, IMA 2012-052. CNMNC Newsletter No. 15, February 2013, page 4; Mineralogical Magazine: 77: 1-12.
Downs, R.T., Pinch, W.W., Thompson, R.M., Evans, S.H., Megaw, L. (2016) Yangite, PbMnSi3O8·H2O, a new mineral species with double wollastonite silicate chains, from the Kombat mine, Namibia. American Mineralogist: 101: 2539-2543.
Thompson, R.M., Yang, H., Downs, R.T. (2016) Ideal wollastonite and the structural relationship between the pyroxenoids and pyroxenes. American Mineralogist: 101: 2544-2553.
Internet Links for Yangite
mindat.org URL:
https://www.mindat.org/min-43575.html
Please feel free to link to this page.
Please feel free to link to this page.
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Localities for Yangite
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - 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).
All localities listed without proper references should be considered as questionable.
Namibia (TL) | |
| Pinch, W.W., Downs, R.T., Evans, S.H., Megaw, L. and Bloch, E.M. (2013) Yangite, IMA 2012-052. CNMNC Newsletter No. 15, February 2013, page 4; Mineralogical Magazine, 77, 1-12. |
Kombat Mine, Kombat, Grootfontein District, Otjozondjupa Region, Namibia