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Yangite

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About YangiteHide

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.


Classification of YangiteHide

Approved
Approval Year:
2012
First Published:
2016

Physical Properties of YangiteHide

Vitreous
Transparency:
Transparent
Colour:
colorless to pale brown (in transmitted light)
Comment:
in transmitted light
Streak:
white
Hardness:
Comment:
ca. 5
Tenacity:
Sectile
Cleavage:
Perfect
on {101}
Parting:
not observed
Density:
4.14(3) g/cm3 (Measured)    4.16 g/cm3 (Calculated)

Optical Data of YangiteHide

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.
Surface Relief:
High
Comments:
Y = b, Z ^ c = 11°

Chemical Properties of YangiteHide

Formula:
PbMnSi3O8•H2O
IMA Formula:
PbMnSi3O8 · H2O

Crystallography of YangiteHide

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)°
Ratio:
a:b:c = 1.32 : 1 : 1.098
Unit Cell V:
392.69 ų
Twinning:
not observed

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
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 YangiteHide

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 YangiteHide

Other InformationHide

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 YangiteHide

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 YangiteHide

Localities for YangiteHide

This 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.

Locality ListHide

- 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). 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.
Namibia (TL)
 
  • Otjozondjupa Region
    • Grootfontein District
      • Kombat
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.
Mineral and/or Locality  
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