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Manganese-bearing Hellandite-(Y)
A variety of Hellandite-(Y)
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Formula:
Ca1.34Mn1.07Y2.75Yb0.38Al0.92Fe0.08Si4B4O21.21(OH)2.79
From Miyawaki et al. (2015)
Colour:
Pinkish yellow
Specific Gravity:
4.06 (Calculated)
Crystal System:
Monoclinic
First Recorded Locality:
A hellandite-(Y) with greater than 1 apfu Mn. Described from the Sc-rich granite pegmatite at Heftetjern, Tørdal, Telemark, Norway where it occurs as tiny pinkish yellow granular crystals (Miyawaki et al., 2015). It varies from hellandite-(Y) in that Mn2+ replaces Ca2+ at the M3 site and there is a significant vacancy at the M4 site. The T site is vacant, and, instead, the O5 position is occupied by (OH)–.
Unique Identifiers
Mindat ID:
52950 (as Manganese-bearing Hellandite-(Y))
1852 (as Hellandite-(Y))
1852 (as Hellandite-(Y))
Long-form identifier:
mindat:1:1:52950:1 (as Manganese-bearing Hellandite-(Y))
mindat:1:1:1852:0 (as Hellandite-(Y))
mindat:1:1:1852:0 (as Hellandite-(Y))
IMA Classification of Manganese-bearing Hellandite-(Y)
First published:
2011
Physical Properties of Manganese-bearing Hellandite-(Y)
Colour:
Pinkish yellow
Density:
4.06 g/cm3 (Calculated)
Chemistry of Manganese-bearing Hellandite-(Y)
Mindat Formula:
Ca1.34Mn1.07Y2.75Yb0.38Al0.92Fe0.08Si4B4O21.21(OH)2.79
From Miyawaki et al. (2015)
From Miyawaki et al. (2015)
Element Weights:
Chemical Analysis
Oxide wt%:
| 1 | |
|---|---|
| CaO | 7.65 % |
| MnO | 7.71 % |
| Y2O3 | 31.60 % |
| La2O3 | 0.04 % |
| Ce2O3 | 0.29 % |
| Nd2O3 | 0.37 % |
| Sm2O3 | 0.25 % |
| Gd2O3 | 0.19 % |
| Dy2O3 | 0.90 % |
| Er2O3 | 0.93 % |
| Yb2O3 | 2.99 % |
| Al2O3 | 4.85 % |
| Fe2O3 | 0.62 % |
| SiO2 | 24.35 % |
| B2O3 | 15.32 % |
| ThO2 | 0.09 % |
| H20 (calc) | 1.83 % |
| Total: | 99.98 % |
Empirical formulas:
| Sample ID | Empirical Formula |
|---|---|
| 1 | Ca1.34Mn1.07Y2.75Ce0.02Nd0.02Sm0.01Gd0.01Dy0.05Er0.05Yb0.15Al0.94Fe0.08Si3.99B4.33O22.00(OH)2.00 |
Sample references:
| ID | Locality | Reference | Notes |
|---|---|---|---|
| 1 | Heftetjern pegmatite, Tørdal, Drangedal, Telemark, Norway | Empirical formula calculted on the basis of Al + Fe + Si = 5 and 24 anions per formula unit. Chemical analysis : EDS mean of 6 analyzed spots. |
Crystallography of Manganese-bearing Hellandite-(Y)
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P2/b
Setting:
P2/a
Cell Parameters:
a = 18.693(17) Å, b = 4.651(3) Å, c = 10.178(7) Å
β = 111.37(6)°
β = 111.37(6)°
Ratio:
a:b:c = 4.019 : 1 : 2.188
Unit Cell V:
824.1 ų
Z:
2
Morphology:
Granular crystals
Comment:
Spacegroup P2/a (# 13)
First Recorded Occurrence of Manganese-bearing Hellandite-(Y)
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.
Internet Links for Manganese-bearing Hellandite-(Y)
mindat.org URL:
https://www.mindat.org/min-52950.html
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References for Manganese-bearing Hellandite-(Y)
Reference List:
Miyawaki, Ritsuro, Momma, Koichi, Yokoyama, Kazumi, Shigeoka, Masako, Matsubara, Satoshi, Ito, Miku, Nakai, Izumi, Kristiansen, Roy (2011) Mn-bearing hellandite -(Y) from Telemark, Norway, in 2011 Joint Annual Meeting of Japan Association of Mineralogical Sciences and The Geological Society of Japan . Abstracts for Annual Meeting of Japan Association of Mineralogical Sciences, 2011 (R1-P20 ) doi:10.14824/jakoka.2011.0.161.0
Localities for Manganese-bearing Hellandite-(Y)
Showing 1 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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.
Norway (FRL) | |
| Miyawaki et al. (2015) +1 other reference |
