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About Hellandite-(Y)Hide

Amund T. Helland
(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2
In the IMA approved report on hellandites [Am. Mineral.,87 (2002), 745–752], the occupancy at the T sites was given as (Be,Li)2–x however the value of x was not specified. Actually it is always x > 1, therefore the T site is vacant in the ideal formulae of hellandite-(Y).
Yellow, green
Crystal System:
Named in 1903 by Waldemar Christofer Brøgger in honor of Amund Theodor Helland [October 11, 1846 Bergen, Norway - November 15, 1918 Oslo "Kristiania", Norway], professor of geology and geography at the Royal Frederick University (University of Oslo). Suffix added by IMA adoption of Levinson's Rule regarding rare earth element dominant minerals.
This page provides mineralogical data about Hellandite-(Y).

Classification of Hellandite-(Y)Hide

Renamed by the IMA
Approval History:
Redefined as hellandite-(Y) by IMA in 2000 (special procedure IMA code 00-F).
Revision of formula: IMA 2017 (CNMNC Newsletter No. 37).

9 : SILICATES (Germanates)
D : Inosilicates
K : Inosilicates with 5-periodic single chains

54 : NESOSILICATES Borosilicates and Some Beryllosilicates
2 : Borosilicates and Some Beryllosilicates with B in [4] coordination

17 : Silicates Containing other Anions
5 : Borosilicates

Physical Properties of Hellandite-(Y)Hide

Yellow, green
5½ on Mohs scale

Optical Data of Hellandite-(Y)Hide

Biaxial (+)
RI values:
nα = 1.640 nβ = 1.650 nγ = 1.660
Measured: 80° , Calculated: 88°
Max Birefringence:
δ = 0.020
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
relatively weak

Chemical Properties of Hellandite-(Y)Hide

(Ca,REE)4Y2Al◻2(B4Si4O22) (OH)2

In the IMA approved report on hellandites [Am. Mineral.,87 (2002), 745–752], the occupancy at the T sites was given as (Be,Li)2–x however the value of x was not specified. Actually it is always x > 1, therefore the T site is vacant in the ideal formulae of hellandite-(Y).
IMA Formula:

Crystallography of Hellandite-(Y)Hide

Crystal System:

Type Occurrence of Hellandite-(Y)Hide

Synonyms of Hellandite-(Y)Hide

Other Language Names for Hellandite-(Y)Hide

Simplified Chinese:硼硅钇钙石
Traditional Chinese:硼矽釔鈣石

Varieties of Hellandite-(Y)Hide

Mn-bearing Hellandite-(Y)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) by that Mn...

Relationship of Hellandite-(Y) to other SpeciesHide

Other Members of this group:
Ferri-mottanaite-(Ce) Ca4Ce2Fe3+(Be1.50.5)[Si4B4O22]O2Mon. 2/m : P2/b
Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2Mon. 2/m
Mottanaite-(Ce)Ca4(Ce,REE)Σ2Al(Be1.50.5)Σ2[B4Si4O22]O2Mon. 2/m
Structurally related to group(s):
Hellandite GroupX4Q2ZT2[B4Si4O22]W2

Common AssociatesHide

Associated Minerals Based on Photo Data:
Schorl4 photos of Hellandite-(Y) associated with Schorl on mindat.org.
Quartz3 photos of Hellandite-(Y) associated with Quartz on mindat.org.
Fergusonite-(Y)3 photos of Hellandite-(Y) associated with Fergusonite-(Y) on mindat.org.
Gadolinite-(Y)3 photos of Hellandite-(Y) associated with Gadolinite-(Y) on mindat.org.
Microcline2 photos of Hellandite-(Y) associated with Microcline on mindat.org.
Hingganite-(Y)2 photos of Hellandite-(Y) associated with Hingganite-(Y) on mindat.org.
Kainosite-(Y)1 photo of Hellandite-(Y) associated with Kainosite-(Y) on mindat.org.
Pilawite-(Y)1 photo of Hellandite-(Y) associated with Pilawite-(Y) on mindat.org.
Allanite-(Y)1 photo of Hellandite-(Y) associated with Allanite-(Y) on mindat.org.
Keiviite-(Y)1 photo of Hellandite-(Y) associated with Keiviite-(Y) on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.DK.05BabingtoniteCa2(Fe,Mn)FeSi5O14(OH)Tric. 1 : P1
9.DK.05MarsturiteNaCaMn3Si5O14(OH)Tric. 1 : P1
9.DK.05RhodoniteMn2+SiO3Tric. 1
9.DK.10SantaclaraiteCaMn4[Si5O14OH](OH) · H2OTric.
9.DK.20Mottanaite-(Ce)Ca4(Ce,REE)Σ2Al(Be1.50.5)Σ2[B4Si4O22]O2Mon. 2/m
9.DK.20Hellandite-(Ce)(Ca,REE)4Ce2Al□2(B4Si4O22) (OH)2Mon. 2/m

Related Minerals - Dana Grouping (8th Ed.)Hide,Ce)4(Ce,Y)2(Ti4+,Fe3+,Al)[B4Si4O22](OH)2Mon.

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

17.5.3SearlesiteNa(H2BSi2O7)Mon. 2 : P21
17.5.5ElbaiteNa(Li1.5Al1.5)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
17.5.9LiddicoatiteCa(Li2Al)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.10DatoliteCaB(SiO4)(OH)Mon. 2/m : P21/b
17.5.11DanburiteCaB2Si2O8Orth. mmm (2/m 2/m 2/m)
17.5.12HowliteCa2B5SiO9(OH)5Mon. 2/m : P21/b
17.5.13BakeriteCa4(H5B5Si3O20)Mon. 2/m : P21/b
17.5.14OyeliteCa10Si8B2O29 · 12.5H2OOrth.
17.5.15KornerupineMg3Al6(Si,Al,B)5O21(OH)Orth. mmm (2/m 2/m 2/m)
17.5.16HarkeriteCa12Mg4Al(BO3)3(SiO4)4(CO3)5 · H2OTrig. 3m (3 2/m) : R3m
17.5.17SerendibiteCa4[Mg6Al6]O4[Si6B3Al3O36]Tric. 1 : P1
17.5.21Okanoganite-(Y)(Na,Ca)3(Y,Ce)12Si6B2O27F14Trig. 3m : R3m
17.5.24Cappelenite-(Y)Ba(Y,Ce)6Si3B6O24F2Trig. 3 : P3
17.5.25Dumortierite(Al,Fe3+)7(SiO4)3(BO3)O3Orth. mmm (2/m 2/m 2/m)
17.5.26Holtite(Ta0.60.4)Al6BSi3O18(O,OH)2.25Orth. mmm (2/m 2/m 2/m) : Pnma
17.5.27DraviteNa(Mg3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.28 FerridraviteNaFe3+3(Mg2Fe3+4)(Si6O18)(BO3)3(OH)3O
17.5.30Uvite SeriesCa(Mg3)MgAl5(Si6O18)(BO3)3(OH)3(F/OH)Trig. 3m : R3m
17.5.32TienshaniteKNa3Na6Ca2Ba6Mn6(Ti4+,Nb)6B12Si36O114(O,OH,F)11Hex. 6/m : P6/m
17.5.34TaramelliteBa4(Fe3+,Ti,Fe2+,Mg)4(B2Si8O27)O2ClxOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.36NagashimaliteBa4(V,Ti)4B2Si8O27(O,OH)2ClOrth. mmm (2/m 2/m 2/m) : Pmmn
17.5.40Axinite-(Mn)Ca2Mn2+Al2BSi4O15(OH)Tric. 1 : P1
17.5.44SchorlNa(Fe2+3)Al6(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.45Fluor-buergeriteNa(Fe3+3)Al6(Si6O18)(BO3)3O3FTrig. 3m : R3m
17.5.46FeruviteCa(Fe2+)3MgAl5(Si6O18)(BO3)3(OH)3(OH)Trig. 3m : R3m
17.5.47Axinite-(Fe)Ca2Fe2+Al2BSi4O15OHTric. 1 : P1
17.5.48HomiliteCa2(Fe2+,Mg)B2Si2O10Mon. 2/m : P21/b
17.5.49Grandidierite(Mg,Fe2+)(Al,Fe3+)3(SiO4)(BO3)O2Orth. mmm (2/m 2/m 2/m)
17.5.50Hyalotekite(Pb,Ba,K)4(Ca,Y)2(B,Be)2(Si,B)2Si8O28(F,Cl)Tric. 1 : P1

Other InformationHide

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 Hellandite-(Y)Hide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Brøgger, W.C. (1903) Über Hellandit, ein neues Mineral (Vorläufige Mittheilungen). Nyt Magazin for Naturvidenskaberne: 41: 213-221.
Brøgger, W.C. (1906) Hellandit von Lindvikskollen bei Kragerö, Norwegen. Zeitschrift für Kristallographie und Mineralogie: 42: 417-439.
Oftedal, I. (1964) On the Chemical Composition of Hellandite. Norsk Geologisk Tidsskrift: 44: 35-37.
Oftedal, I. (1965) Über den Hellandit. Tscherm. Miner. Petrogr. Mitteilungen (Mineralogy and Petrology): 10: 125-129.
Hogarth, D.D., Chao, G.Y., Harris, D.C. (1972) New data on hellandite. Canadian Mineralogist: 11: 760-776.
Mellini, M., Merlino, S. (1977) Hellandite: a new type of silicoborate chain. American Mineralogist: 62: 89-99.
Oberti, R., Della Ventura, G., Ottolini, L., Hawthorne, F.C., Bonazzi, P. (2002) Re-definition, nomenclature and crystal-chemistry of the hellandite group. American Mineralogist: 87: 745-752.
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. Canadian Mineralogist 53, 345-356.
CNMNC Newsletter No. 37, Mineralogical Magazine, June 2017, Vol. 81(3), p. 742 [IMA revision of Formula]

Internet Links for Hellandite-(Y)Hide

Localities for Hellandite-(Y)Hide

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.
  • Ontario
    • Nipissing District
      • Murchison Township
Reiner Mielke 2013
  • Québec
    • Nord-du-Québec
      • Matagami
Canadian Mineralogist, 32, 33–147; American Mineralogist (1999) 84, pages 913–921
    • Outaouais
      • Les Collines-de-l'Outaouais RCM
        • Val-des-Monts
          • Lac Saint-Pierre (Wakefield Lake)
Canadian Mineralogist Vol. 12, pp. 298-298 (1974)
  • Hebei
    • Baoding
      • Quyang Co.
Dizhi Xuebao, 60, 68–77; American Mineralogist, Volume 84, pages 913–921, 1999
  • Occitanie
    • Ariège
      • Luzenac
Le Cahier des Micromonteurs Year 1990 N° 4
  • Piedmont
    • Cuneo Province
      • Bagnolo Piemonte
Flavio G. Taricco collection - Analized by SIUK AMI (Associazione Micromineralogica Italiana)
    • Metropolitan City of Turin
      • Pellice Valley
        • Luserna Valley
- Finello, G., Ambrino, P., Kolitsch, U., Ciriotti, M.E., Blaß, G., Bracco, R. (2007): I minerali della “Pietra di Luserna”, Piemonte, Italia nord-occidentale. I. Alcune cave di gneiss della Val Luserna. Micro (località), 2/2007, 181-226.
    • Verbano-Cusio-Ossola Province
      • Baveno
        • Oltrefiume
          • Mount Camoscio
Sergio Varvello collection
  • Sardinia
    • Sassari Province
      • La Maddalena
        • La Maddalena Island
Gamboni, A. (2003): Cala Francese - La Maddalena (SS). Micro (località), 2003, 11-20
  • Gifu
    • Nakatsugawa City
      • Hirukawa
Miyawaki, R. et al (1987) Kobutsugaku Zasshi, 18, 17–30; American Mineralogist, 84, pages 913–921, 1999
  • Miyazaki
    • Nobeoka
      • Kitagawa
Okada, T. (2011) Hellandite from Mt. Ookueyama, Kitagawa Town, Nobeoka City, Miyazaki Prefecture, Japan. Chigaku Kenkyu, 60 (1), 25-31.
  • Aust-Agder
    • Iveland
Müller, A., Kearsley, A., Spratt, J. and Seltmann, R. (2012): Petrogenetic implications of magmatic garnet in granitic pegmatites from Southern Norway. Canadian Mineralogist. 50,1095-1115
  • Nordland
    • Tysfjord
      • Drag
Tomas Husdal data
  • Telemark
    • Bamble
      • Skogstad
Larsen, A.O., Škoda, R., Åsheim, A. (2016): Yttrian epidote and allanite-(Y) from a granite pegmatite in Bamble, Telemark, Norway. Norsk mineralsymposium 2016, 33-38.
    • Drangedal
      • Tørdal
Raade, G. & Kristiansen, R. (2000a): Mineralogy and geochemistry of the Heftetjern granite pegmatite, Tørdal: a progress report. Norsk Bergverksmuseum Skrifter. 17, 19-25; 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. Canadian Mineralogist 53, 345-356.
    • Kragerø
      • Lindvikskollen-Kalstadgangen pegmatite
Brøgger, W.C. (1903): Über Hellandit, ein neues Mineral (Vorlaüfige Mittheilungen). Nyt Magazin for Naturvidenskaberne 41, 213-221; Brøgger, W. C. (1906): Hellandit von Lindvikskollen bei Kragerö. Zeitschrift für Kristallographie und Mineralogie 42, 417-439 ; American Mineralogist, 62, 89, 1977); American Mineralogist, 87, pages 745–752, 2002;
  • Lower Silesian Voivodeship
    • Dzierżoniów Co.
      • Piława Górna
        • DSS Piława Górna Quarry
Pieczka, A., Hawthorne, F.C., Cooper, M.A., Szełęg, E., Szuszkiewicz, A., Turniak, K., Nejbert, K., Ilnicki, S. (2015): Pilawite-(Y), Ca2(Y,Yb)2[Al4(SiO4)4O2(OH)2], a new mineral from the Piława Górna granitic pegmatite, southwestern Poland: mineralogical data, crystal structure and association. Mineralogical Magazine, 79, 1143-1157.
  • Gorno-Badakhshan
P,M. Kartashov data
  • New Jersey
    • Sussex Co.
      • Franklin Mining District
        • Franklin
John Cianciulli, Curator, Franklin Min. Museum; analysis by Andy Roberts (pending publication in The Picking Table).
Mineral and/or Locality  
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