Hellandite Group
A group of related mineral species
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About Hellandite Group
Formula:
X4Y2ZT2[B4Si4O22]W2
X = Na, Ca, Y, LREE3+ at the eightfold-coordinated M3 and M4 sites
Y = Ca, Y, HREE3+, Th4+, U4+ at the eightfold-coordinated M2 site
Z = Al, Mn3+, Fe3+, Ti4+ at the octahedral M1 site T = □, Li, Be at the new tetrahedrally coordinated site
and W = OH, F, O2– at the O5 site (Oberti et al. 2002)
Y = Ca, Y, HREE3+, Th4+, U4+ at the eightfold-coordinated M2 site
Z = Al, Mn3+, Fe3+, Ti4+ at the octahedral M1 site T = □, Li, Be at the new tetrahedrally coordinated site
and W = OH, F, O2– at the O5 site (Oberti et al. 2002)
Name:
Amund Theodor Helland [October 11, 1846 Bergen, Norway - November 15, 1918 Oslo "Kristiania", Norway],was professor of geology and geography at the Royal Frederick University (University of Oslo).
Unique Identifiers
Mindat ID:
29214
Long-form identifier:
mindat:1:1:29214:8
GUID
(UUID V4):
(UUID V4):
793e0572-5b2c-4fe8-9ae8-43e9b41b3204
IMA Classification of Hellandite Group
IMA status notes:
IMA Approved Group Name, Redefined by the IMA
Approval history:
The hellandite group was redefined by IMA in 2000 (code 00-F).
Chemistry of Hellandite Group
Mindat Formula:
X4Y2ZT2[B4Si4O22]W2
X = Na, Ca, Y, LREE3+ at the eightfold-coordinated M3 and M4 sites
Y = Ca, Y, HREE3+, Th4+, U4+ at the eightfold-coordinated M2 site
Z = Al, Mn3+, Fe3+, Ti4+ at the octahedral M1 site T = □, Li, Be at the new tetrahedrally coordinated site
and W = OH, F, O2– at the O5 site (Oberti et al. 2002)
X = Na, Ca, Y, LREE3+ at the eightfold-coordinated M3 and M4 sites
Y = Ca, Y, HREE3+, Th4+, U4+ at the eightfold-coordinated M2 site
Z = Al, Mn3+, Fe3+, Ti4+ at the octahedral M1 site T = □, Li, Be at the new tetrahedrally coordinated site
and W = OH, F, O2– at the O5 site (Oberti et al. 2002)
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) |
---|---|---|---|---|---|---|---|
0000557 | Hellandite-(Y) | Mellini M, Merlino S (1977) Hellandite: a new type of silicoborate chain American Mineralogist 62 89-99 | 1977 | 0 | 293 | ||
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 | |
0005547 | Tadzhikite-(Ce) | Hawthorne F C, Cooper M A, Taylor M C (1998) Refinement of the crystal structure of tadzhikite The Canadian Mineralogist 36 817-822 | 1998 | Dara-i-Pioz, Tadzhikistan | 0 | 293 | |
0015611 | Tadzhikite-(Ce) | Chernitsova N M, Pudovkina Z V, Pyatenko Y A (1982) About the crystal structure of tadzhikite {(Ca,Tr)4(Y,Tr)2(Ti,Fe,Al)(O,OH)2 [Si4B4O22]} Soviet Physics Doklady 27 367-368 | 1982 | 0 | 293 | ||
0002818 | Mottanaite-(Ce) | Della Ventura G, Bonazzi P, Oberti R, Ottolini L (2002) Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy) American Mineralogist 87 739-744 | 2002 | 0 | 293 | ||
0002819 | Ciprianiite | Della Ventura G, Bonazzi P, Oberti R, Ottolini L (2002) Ciprianiite and mottanaite-(Ce), two new minerals of the hellandite group from Latium (Italy) American Mineralogist 87 739-744 | 2002 | 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 |
CIF Raw Data - click here to close
Relationship of Hellandite Group to other Species
Group Members:
Ciprianiite | Ca4[(Th,U),Ca]Σ2Al(Be0.5◻1.5)Σ2[B4Si4O22](OH)2 | Mon. 2/m : P2/b |
Ferri-hellandite-(Ce) | (Ca3Ce)Ce2Fe3+◻2B4Si4O22(OH)2 | Mon. 2/m : P2/b |
Ferri-mottanaite-(Ce) | Ca4Ce2Fe3+(Be1.5◻0.5)[Si4B4O22]O2 | Mon. 2/m : P2/b |
Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m |
Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 | Mon. 2/m : P2/b |
Mottanaite-(Ce) | Ca4(Ce,REE)Σ2Al(Be1.5◻0.5)Σ2[B4Si4O22]O2 | Mon. 2/m |
Tadzhikite-(Ce) | Ca4Ce3+2Ti◻2(B4Si4O22)(OH)2 | Mon. 2/m : P2/b |
Minerals structurally related to group:
Hellandite-(Ce) | (Ca,REE)4Ce2Al◻2(B4Si4O22) (OH)2 | |
Hellandite-(Y) | (Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2 |
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 Group
mindat.org URL:
https://www.mindat.org/min-29214.html
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References for Hellandite Group
Reference List:
Localities for Hellandite Group
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
All localities listed without proper references should be considered as questionable.
Lindvikskollen Quarry, Lindvikskollen-Kalstadgangen pegmatite, Kragerø, Telemark, Norway