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Sugilite

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Formula:
K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
System:
Hexagonal
Colour:
light brownish-yellow, ...
Lustre:
Vitreous
Hardness:
6 - 6½
Member of:
Name:
Named after Ken-ichi Sugi (1901-1948), Japanese petrologist. (The name is commonly mispronounced with a soft G, as in "gene", whereas the correct pronunciation is a hard G, as in "geese".)

Sugilite is an example of a mineral name pronounced wrongly more often than correctly. Named after Japanese petrologist Dr Kenichi Sugi, whose name is pronounced with a hard "g" (as in "geese"), whereas most english speakers mispronounce it with a soft "g" (as in "gene"). This wasn't much of an issue when sugilite was just an obscure ugly greenish-yellowish-brown rock-forming mineral from Japan, but when it was found in South Africa as large quantities of bright purple lapidary rock and thousands of people in the gem trade started talking about it, the bad pronunciation got entrenched (Alfredo Petrov 2014)

Classification of Sugilite

Approved
Approval Year:
1974
8/E.22-110
9.CM.05

9 : SILICATES (Germanates)
C : Cyclosilicates
M : [Si6O18]12- 6-membered double rings (sechser-Doppelringe)
63.2.1a.9

63 : CYCLOSILICATES Condensed Rings
2 : Condensed Rings (Milarite - Osumilite group)
16.1.17

16 : Silicates Containing Aluminum and other Metals
1 : Aluminosilicates of Li
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Type Occurrence of Sugilite

Physical Properties of Sugilite

Vitreous
Colour:
light brownish-yellow, purple, colourless in transmitted light
Hardness (Mohs):
6 - 6½

Crystallography of Sugilite

Crystal System:
Hexagonal
Cell Parameters:
a = 10Å, c = 14Å
Ratio:
a:c = 1 : 1.4
Unit Cell Volume:
V 1,212.44 ų (Calculated from Unit Cell)
X-Ray Powder Diffraction Data:
d-spacingIntensity
8.65 (7)
6.98 (13)
4.78 (7b)
4.32 (100)
4.06 (55)
3.68 (13)
3.50 (25)
3.27 (7)
3.25 (8)
3.19 (80)
2.876 (50b)
2.725 (13)
2.678 (11b)
2.499 (18)
2.401 (7b)
2.273 (6b)
2.231 (8b)
2.159 (13)
1.983 (13b)
1.890 (8)
1.874 (11)
1.827 (8b)
1.820 (7b)
1.757 (7b)
1.711 (8b)
1.666 (10b)
1.627 (6b)
1.551 (7b)
1.508 (8b)
1.439 (7)
1.420 (5b)
1.391 (10)
1.385 (5)
1.364 (5)
1.311 (5)
1.200 (5)
Comments:
JCPDS 29-824

Optical Data of Sugilite

Type:
Uniaxial (-)
RI values:
nω = 1.610 nε = 1.607
Max Birefringence:
δ = 0.003
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate

Chemical Properties of Sugilite

Formula:
K(Na,□)2Li3(Fe,Mn,Al,Zr)2[Si12O30]
Idealised Formula:
KNa2Li3Fe2[Si12O30]
All elements listed in formula:
Common Impurities:
Ti,H2O

Relationship of Sugilite to other Species

Member of:
Other Members of Group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
ArmeniteBaCa2Al6Si9O30 · 2H2O
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
EifeliteKNa3Mg4Si12O30
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30
Klöchite(□Na)KFe22+Zn3(Si12O30)
Merrihueite(K,Na)2(Fe,Mg)5Si12O30
MilariteK2Ca4Al2Be4Si24O60 · H2O
Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
Osumilite-(Mg)KMg2Al3(Al2Si10)O30
PoudretteiteKNa2B3Si12O30
Roedderite(Na,K)2(Mg,Fe)5Si12O30
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2O
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30
9.CM.05DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]
9.CM.05EifeliteKNa3Mg4Si12O30
9.CM.05Merrihueite(K,Na)2(Fe,Mg)5Si12O30
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2O
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30
9.CM.05Osumilite(K,Na)(Fe2+,Mg)2(Al,Fe3+)3(Si,Al)12O30
9.CM.05PoudretteiteKNa2B3Si12O30
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]
16.1.1PetaliteLiAl(Si4O10)
16.1.2SpodumeneLiAlSi2O6
16.1.3EucryptiteLiAlSiO4
16.1.4VirgiliteLiAlSi2O6
16.1.5Cookeite(Al2Li)Al2(AlSi3O10)(OH)8
16.1.6BikitaiteLiAlSi2O6 · H2O
16.1.7LunijianlaiteLi0.7Al6.2(AlSi7O20)(OH,O)10
16.1.8SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2O
16.1.9Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2
16.1.13Clino-holmquistite Root Name☐{Li2}{Z32+Z23+}(Si8O22)(OH,F,Cl)2
16.1.14Magnesioholmquistite
16.1.15BityiteLiCaAl2(AlBeSi2O10)(OH)2
16.1.16SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]

Other Names for Sugilite

Name in Other Languages:

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.

References for Sugilite

Reference List:
Murakami N., Kato T., Miura Y., Hirowatari F. (1976): Sugilite, a new silicate mineral from Iwagi Islet, southwest Japan. Mineralogical Journal: 8: 110-121.

Kato T., Miura Y., Murakami N. (1976): Crystal structure of sugilite. Mineralogical Journal: 8: 184-192.

American Mineralogist (1977): 596.

Armbruster T., Oberhansli R. (1988): Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite. American Mineralogist: 73: 595-600.

Internet Links for Sugilite

Localities for Sugilite

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.
(TL) indicates type locality for a valid mineral species. (FRL) indicates first recorded locality for everything else. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
Australia
 
  • New South Wales
    • Darling Co.
      • Tamworth
Kawachi Y., Ashley P. M., Vince D., Goodwin M., 1994. Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia. Mineralogical Magazine, 58: 671-677
    • Forbes Co.
      • Grenfell
Kawachi Y., Ashley P. M., Vince D., Goodwin M., 1994. Sugilite in manganese silicate rocks from the Hoskins mine and Woods mine, New South Wales, Australia. Mineralogical Magazine, 58: 671-677 ; Oberti, R., Boiocchi, M., Hawthorne, F. C., Ball, N. A., & Ashley, P. M. (2016). PREPUBLICATION: Oxo-mangani-leakeite from the Hoskins mine, New South Wales, Australia: occurrence and mineral description. Mineralogical Magazine.
Canada
 
  • Québec
    • Montérégie
      • La Vallée-du-Richelieu RCM
        • Mont Saint-Hilaire
HORVÁTH, L., PFENNINGER HORVÁTH, E. (2000) I minerali di Mont-Saint-Hilaire (Québec, Canada) Rivista Mineralogica Italiana, XXIV, 140-202 (in Italian with English summary).
Italy
 
  • Liguria
    • La Spezia Province
      • Vara Valley
        • Borghetto Vara
Palenzona A. (1990) - La Sugilite di Cerchiara (SP) - Rivista Mineralogica Italiana, fasc. 3, pp. 153-154; Cabella R., Lucchetti G., Palenzona A., 1990. Al-rich, Fe-poor manganoan sugilite in a pectolite-bearing assemblage from Cerchiara Mine (Northern Appennines, Italy). N. Jb. Miner. Mh., 10: 443-448.
  • Tuscany
    • Lucca Province
      • Apuan Alps
        • Vagli di Sotto
Biagioni C., 2004. Le mineralizzazioni manganesifere dei Diaspri Auctt. di Vagli (Alpi Apuane, Lucca). Tesina di Laurea inedita, Università di Pisa.
Japan (TL)
 
  • Ehime Prefecture
    • Inland Sea (Setonaikai)
NJMM (1990), 443; Am Min 84 (1999), 764; Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121
  • Shikoku Island
    • Ehime Prefecture
      • Iyo-gun
        • Tobe-cho
Dr. Yohachiro Okamoto collection (curated at Geological Survey museum, Japan)
South Africa
 
  • Northern Cape Province
    • Kalahari manganese field
      • Hotazel
Minerals of South Africa; Gait, R., & Williams, M. P. (1980). Sugilite, a Second Occurrence: Wessels Mine, Kalahari Manganese Field, Republic of South Africa. Canadian Mineralogist, 18, 37-39.; Gnos, E., Armbruster, T., & Villa, I. M. (2003). Norrishite, K (Mn23+ Li) Si4O10 (O) 2, an oxymica associated with sugilite from the Wessels Mine, South Africa: Crystal chemistry and 40Ar-39Ar dating. American Mineralogist, 88(1), 189-194.; Shigley, J. E., Koivula, J. I., & Fryer, C. W. (1987). The occurrence and gemological properties of Wessels Mine sugilite. Gems & gemology, 78-89.; Giester, G., & Rieck, B. (1996). Wesselsite, SrCu [Si4Olo], a further new gillespite-group mineral from the Kalahari Manganese Field, South Africa. Mineralogical Magazine, 60, 795-798.; Rumsey, M. S., Welch, M. D., Kampf, A. R., & Spratt, J. (2013). Diegogattaite, Na2CaCu2Si8O20· H2O: a new nanoporous copper sheet silicate from Wessels Mine, Kalahari Manganese Fields, Republic of South Africa. Mineralogical Magazine, 77(8), 3155-3162.
      • Kuruman
        • N'Chwaning Mines
[Von Bezing, K. L. et al. (1991) - The Kalahari (Afrique du Sud) manganese field : an update, Mineralogical Record, 22 (3), 279-302.]
Minerals of South Africa
Yang, H., Gu, X., Xie, X., van Nieuwenhuizen, J.J., Evans, S.H. and Downs, R.T. (2015) Lipuite, IMA 2014-085. CNMNC Newsletter No. 23, February 2015, page 58; Mineralogical Magazine, 79, 51-58.
    • Postmasburg manganese field
      • Kathu
        • Sishen
John M. Moore, Barbara K. Kuhn, Darren F. Mark, and Harilaos Tsikos (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. Eur. J. Mineral. 23, 661-673.
Moore, J.M., Kuhn, B., Mark, D.F., Tsikos, H. (2011): A sugilite-bearing assemblage from the Wolhaarkop breccia, Bruce iron-ore mine, South Africa: Evidence for alkali metasomatism and 40Ar-39Ar dating. European Journal of Mineralogy: 23: 661-673; http://forum.amiminerals.it/viewtopic.php?f=5&t=7909 (2016)
Tajikistan
 
  • Region of Republican Subordination
    • Tien Shan Mtn
      • Alai Range (Alayskiy)
Canadian Mineralogist 42:107-119 (2004); Agakhanov A.A., Pautov L.A., Karpenko V.Yu., Bekenova G.K., Uvarova Y.A. (2011) Orlovite, KLi2 TiSi4 O11F, a new mineral of the mica group New Mineral Data 46:13-19
Mineral and/or Locality  
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