Hellandite
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About Hellandite
Synonym of:
This page provides mineralogical data about Hellandite.
Unique Identifiers
Mindat ID:
6987
Long-form identifier:
mindat:1:1:6987:4
Similar Names
| Hellandite-(Ce) | A valid IMA mineral species | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 |
| Hellandite-(Y) | A valid IMA mineral species | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 |
| Hellandite-(Yb) | (Ca,Y)4(Yb,Y)2(Al,Fe3+,Ti4+)(Be,Li)2[B4Si4O22](O,F,OH)2 | |
| Heulandit | A synonym of Heulandite Subgroup | |
| Hollandite | A valid IMA mineral species - grandfathered | Ba(Mn64+Mn23+)O16 |
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. |
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0020232 | Hellandite-(Y) | Miyawaki R, Momma K, Yokoyama K, Shigeoka M, Matsubara S, Ito M, Nakai I, Kristiansen R (2015) Mn-bearing hellandite-(Y) from the Heftetjern pegmatite, Tordal, Norway The Canadian Mineralogist 53 345-356 | 2015 | Heftetjern, Tordal, Telemark, Norway | 0 | 293 | |
| 0002237 | Hellandite-(Ce) | Oberti R, Ottolini L, Camara F, Della Ventura G (1999) Crystal structure of non-metamict Th-rich hellandite-(Ce) from Latium (Italy) and crystal chemistry of the hellandite-group minerals American Mineralogist 84 913-921 |  | 1999 | 0 | 293 | |
| 0000557 | Hellandite-(Y) | Mellini M, Merlino S (1977) Hellandite: a new type of silicoborate chain American Mineralogist 62 89-99 | | 1977 | 0 | 293 |
CIF Raw Data - click here to close
Other Language Names for Hellandite
Common Associates
Associations Based on Photo Data:
| 2 photos of Hellandite associated with Pyrochlore Group | A2Nb2(O,OH)6Z |
| 2 photos of Hellandite associated with Sanidine | K(AlSi3O8) |
| 1 photo of Hellandite associated with Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 |
| 1 photo of Hellandite associated with Baddeleyite | ZrO2 |
| 1 photo of Hellandite associated with Allanite-(Ce) | (CaCe)(AlAlFe2+)O[Si2O7][SiO4](OH) |
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 Hellandite
mindat.org URL:
https://www.mindat.org/min-6987.html
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References for Hellandite
Reference List:
Localities for Hellandite
Showing 46 localities.
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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.
Lindvikskollen Quarry, Lindvikskollen-Kalstadgangen pegmatite, Kragerø, Telemark, Norway