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About SugiliteHide

Ken-ichi Sugi
purple, violet, light brownish-yellow, colourless in transmitted light
6 - 6½
Specific Gravity:
2.74 - 2.79
Crystal System:
Member of:
Named by Nobuhide Murakami, Toshio Kato, Yasunori Miura, and Fumitoshi Hirowatari in 1976 in honor of Ken-ichi Sugi (杉健一) (15 May 1901, Kashiwazaki, Niigata Prefecture, Japan - 16 July 1948, Fukuoka, Fukuoka Prefecture, Japan), petrologist at the Imperial University Kyushu, who first found the occurrence of the mineral with M. Kutsuna.

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 became entrenched (Alfredo Petrov 2014).

Classification of SugiliteHide

Approval Year:
First Published:

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

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

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

Pronounciation of SugiliteHide

PlayRecorded byCountry
Jolyon & Katya RalphUnited Kingdom

Physical Properties of SugiliteHide

purple, violet, light brownish-yellow, colourless in transmitted light
6 - 6½ on Mohs scale
2.74 - 2.79 g/cm3 (Measured)    2.80 g/cm3 (Calculated)

Optical Data of SugiliteHide

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:

Chemical Properties of SugiliteHide

IMA Formula:
Idealised Formula:
Common Impurities:

Crystallography of SugiliteHide

Crystal System:
Cell Parameters:
a = 10 Å, c = 14 Å
a:c = 1 : 1.4
Unit Cell V:
1,212.44 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
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)
JCPDS 29-824

Type Occurrence of SugiliteHide

Place of Conservation of Type Material:
Yamaguchi University, Yamaguchi.
Sakurai Museum, Tokyo.
National Science Museum, Tokyo, Japan.
The Natural History Museum, London, England, 1975,342.
National Museum of Natural History, Washington, D.C., USA, 133982.
Geological Setting of Type Material:
Aegirine syenite.
Associated Minerals at Type Locality:

Synonyms of SugiliteHide

Other Language Names for SugiliteHide

Relationship of Sugilite to other SpeciesHide

Member of:
Other Members of this group:
Agakhanovite-(Y)(YCa)□2KBe3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
FriedrichbeckeiteK(□0.5Na0.5)2Mg2Be3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Klöchite(□Na)KFe2+2Zn3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P63/mmc
MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
Unnamed (Al-dominant analog of Sugilite)K(Na,□)2Li3(Al,Mn,Fe)2[Si12O30]
Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)

Common AssociatesHide

Associated Minerals Based on Photo Data:
Pectolite21 photos of Sugilite associated with Pectolite on mindat.org.
Wesselsite18 photos of Sugilite associated with Wesselsite on mindat.org.
Quartz11 photos of Sugilite associated with Quartz on mindat.org.
Effenbergerite10 photos of Sugilite associated with Effenbergerite on mindat.org.
Ruizite4 photos of Sugilite associated with Ruizite on mindat.org.
Tuperssuatsiaite3 photos of Sugilite associated with Tuperssuatsiaite on mindat.org.
Lavinskyite3 photos of Sugilite associated with Lavinskyite on mindat.org.
Scottyite3 photos of Sugilite associated with Scottyite on mindat.org.
Braunite3 photos of Sugilite associated with Braunite on mindat.org.
Hennomartinite2 photos of Sugilite associated with Hennomartinite on mindat.org.

Related Minerals - Nickel-Strunz GroupingHide

9.CM.05ArmeniteBaCa2Al6Si9O30 · 2H2OOrth. mmm (2/m 2/m 2/m) : Pnna
9.CM.05Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ChayesiteK(Mg,Fe)4FeSi12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Osumilite-(Mg)KMg2Al3(Al2Si10)O30 Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c
9.CM.05SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)
9.CM.05BerezanskiteK□2Li3(Ti,Zr,Sn)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05ShibkoviteK(□,K,Na)2Zn3Ca2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05AlmaruditeK(□,Na)2(Mn2+,Fe2+,Mg)2(Be,Al)3[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mmm
9.CM.05Trattnerite□(Fe3+,Mg,Fe2+)2(Mg,Fe2+,Fe3+)3(Si12O30)Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.05OftedaliteK(Sc,Ca,Mn2+)22[(Be,Al)3Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
9.CM.10FaizieviteK2Na(Ca6Na)Ti4Li6[F2|Si24O66]Tric. 1 : P1

Related Minerals - Dana Grouping (8th Ed.)Hide

63.2.1a.1Brannockite(K,Na)□2Li3(Sn,Zr,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.2ChayesiteK(Mg,Fe)4FeSi12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.3DarapiositeK(Na,◻,K)2(Li,Zn,Fe)3(Mn,Zr,Y)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.8PoudretteiteKNa2B3Si12O30Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.10Yagiite(Na,K)3Mg4(Al,Mg)6(Si,Al)24O60Hex. 6/mmm (6/m 2/m 2/m)
63.2.1a.11DusmatoviteK(Na,□)2(Zn,Li)3(Mn2+,Y,Zr)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.12MilariteK2Ca4Al2Be4Si24O60 · H2OHex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.13SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc
63.2.1a.14Roedderite(Na,K)2(Mg,Fe)5Si12O30Hex. 6 m2 : P62c

Related Minerals - Hey's Chemical Index of Minerals GroupingHide

16.1.1PetaliteLiAl(Si4O10)Mon. 2/m : P2/b
16.1.3EucryptiteLiAlSiO4Trig. 3 : R3
16.1.4VirgiliteLiAlSi2O6Hex. 6 2 2 : P62 2 2
16.1.5Cookeite(Al2Li)Al2(AlSi3O10)(OH)8Mon. 2/m
16.1.6BikitaiteLiAlSi2O6 · H2OTric. 1 : P1
16.1.8SwineforditeLi(Al,Li,Mg)4((Si,Al)4O10)2(OH,F)4 · nH2OMon.
16.1.13Clino-holmquistite Root Name☐{Li2}{Z2+3Z3+2}(Si8O22)(OH,F,Cl)2Mon.
16.1.15BityiteLiCaAl2(AlBeSi2O10)(OH)2Mon. 2/m : B2/b
16.1.16SogdianiteK(□,Na)2Li3(Zr,Fe,Ti)2[Si12O30]Hex. 6/mmm (6/m 2/m 2/m) : P6/mcc

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 SugiliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sugi, K., Kutsuna, M. (1944) Journ. Japan. Assoc. Miner. Petrol. Econ. Geol.: 31: 209.
Murakami, N., Matsunaga, S. (1966) Sci. Rept. Yamaguchi Univ.: 16: 17.
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.
Fleischer, M., Cabri, L.J., Nickel, E.H., Pabst, A. (1977) New mineral names. American Mineralogist: 62: 593-600.
Dunn, P.J., Brummer, J.J., Belsky, H. (1980) Sugilite, a second occurrence: Wessels mine, Kalahari manganese field, Republic of South Africa. The Canadian Mineralogist: 18: 37-39.
Shigley, J.E., Koivula, J.I., Fryer, C.W. (1987) The occurrence and gemological properties of Wessels Mine sugilite. Gems & Gemology: 78-89.
Armbruster T., Oberhansli R. (1988) Crystal chemistry of double-ring silicates: Structures of sugilite and brannockite. American Mineralogist: 73: 595-600.
Cabella, R., Lucchetti, G., Palenzona, A. (1990) Al-rich, Fe-poor manganoan sugilite in a pectolite-bearing assemblage from Cerchiara Mine (Northern Apennines, Italy). Neues Jahrbuch für Mineralogie Mh.: 10: 443-448.
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.
Geiger, C.A. (2009) A 57Fe Mössbauer spectroscopic study of sugilite, KNa2(Fe3+,Mn3+,Al)2Li3Si12O30. The Canadian Mineralogist: 47: 927-931.
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.

Internet Links for SugiliteHide

Localities for SugiliteHide

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.
  • 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.
  • 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).
Clark, A. M., Bearne, G. S., Fejer, E. E., Din, V. K., & Couper, A. G. (1980). Additional data on sugilite. Mineral. Mag, 43, 947-9.
  • 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
      • 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
    • Inland Sea (Setonaikai)
NJMM (1990), 443; Am Min 84 (1999), 764; Mineralogical Journal Vol. 8 (1975) , No. 1 pp110-121; Pautov, L. A., Karpenko, V. Y., & Agakhanov, A. A. (2013) Baratovite-katayamalite Minerals from the Hodzha-achkan Alcaline Massif (Kirgizia). New Data on Minerals. 48:12-36
    • Iyo-gun
      • Tobe-cho
Dr. Yohachiro Okamoto collection (curated at Geological Survey museum, Japan)
South Africa
  • Northern Cape
    • 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)
  • Districts 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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