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Proto-ferro-suenoite

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Formula:
☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Suenoite has Mn as the dominant in the B position. They are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The suenoite is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Proto-ferro-suenoite is defined with Pnmn symmetry and and Fe2+ as the dominant element in the C position.
System:
Orthorhombic
Colour:
White to brownish-grey.
Lustre:
Vitreous
Hardness:
5½ - 6
Name:
Named after Professor Shigeho Sueno (1937–2001), Professor
of Mineralogy at the University of Tsukuba and fellow of the Mineralogical Society of America.

Proto-ferro-suenoite was originally named protomangano-ferro-anthophyllite.
Proto-ferro-suenoite is a very rare mineral known from only two localities (2016). It occurs as up to 15mm acicular crystals in wheat formed aggregates together with rhodonite, pyroxmangite, spessartine and rhodochrosite at the type locality and as an small (sub-mm to mm ) fibres as an alteration product of Mn-rich fayalite at

Proto-ferro-suenoite can only be identified by a combination of EMPA, XRD and single crystal structure refinement, and the mineral should only be added to a new locality if properly identified.

Classification of Proto-ferro-suenoite

Approved
Notes:
Renamed by the IMA
Approval Year:
1986
First Published:
1998
8/F.12-160
9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
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Type Occurrence of Proto-ferro-suenoite

General Appearance of Type Material:
light yellow-brown acicular crystals up to 15mm in aggregates resembling wheat sheafs. It appears to be the dominant amphibole at the locality
Geological Setting of Type Material:
metamorphic manganese deposit

Occurrences of Proto-ferro-suenoite

Geological Setting:
Alteration product of Mn bearing fayalite.

Physical Properties of Proto-ferro-suenoite

Vitreous
Colour:
White to brownish-grey.
Streak:
White to greyish-white
Hardness (Mohs):
5½ - 6

Crystallography of Proto-ferro-suenoite

Crystal System:
Orthorhombic

Optical Data of Proto-ferro-suenoite

Type:
Biaxial (-)
RI values:
nα = 1.695 nβ = 1.714 nγ = 1.731
Max Birefringence:
δ = 0.036
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
High
Dispersion:
relatively strong

Chemical Properties of Proto-ferro-suenoite

Formula:
☐{Mn22+}{Fe52+}(Si8O22)(OH)2

Suenoite has Mn as the dominant in the B position. They are orthorhombic amphiboles in the magnesium-iron-manganese amphibole subgroup. The minerals in this root name group may have either Pnma or Pnmn (proto- prefixed name) space group symmetry. The suenoite is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Proto-ferro-suenoite is defined with Pnmn symmetry and and Fe2+ as the dominant element in the C position.
All elements listed in formula:

Relationship of Proto-ferro-suenoite to other Species

Other Members of Group:
Anthophyllite Root Name☐{X2}{Z5}(Si8O22)(OH)2
Cummingtonite☐{Mg2}{Mg5}(Si8O22)(OH)2
Gedrite Root Name☐{X22+}{Z32+Z23+}(Al2Si6O22)(OH)2
Grunerite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
Manganocummingtonite☐{Mn22+}{Mg5}(Si8O22)(OH)2
Manganogrunerite☐{Mn22+}{Fe52+}(Si8O22)(OH)2
Sodic-ferro-anthophyllite{Na}{Fe22+}{Fe52+}(AlSi7O22)(OH)2
Sodic-ferrogedrite{Na}{Fe22+}{Fe32+Al2}(Al3Si5O22)(OH)2
Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2
Sodicgedrite{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(OH)2
9.DD.05Ferro-anthophyllite☐{Fe22+}{Fe52+}(Si8O22)(OH)2
9.DD.05Ferro-gedrite☐{Fe22+}{Fe32+Al2}(Al2Si6O22)(OH)2
9.DD.05Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2
9.DD.05Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2
9.DD.05Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2
9.DD.05Sodic-ferro-anthophyllite{Na}{Fe22+}{Fe52+}(AlSi7O22)(OH)2
9.DD.05Sodic-ferrogedrite{Na}{Fe22+}{Fe32+Al2}(Al3Si5O22)(OH)2
9.DD.05Sodicgedrite{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(OH)2
9.DD.05Ferro-holmquistite☐{Li2}{Fe32+Al2}(Si8O22)(OH)2
9.DD.05Proto-anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2

Other Names for Proto-ferro-suenoite

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 Proto-ferro-suenoite

Reference List:
Sueno, S., Matsuura, S., Gibbs, G.V., Boisen, M.B. (1998) A crystal chemical study of protoanthophyllite: orthoamphiboles with the protoamphibole structure. Physics and Chemistry of Minerals: 25: 366-377.

Jambor, J.L. (1999) New mineral names - Protoferro-anthophyllite, protomangano-ferro-anthophyllite. American Mineralogist: 84: 196.

Sueno, S., Matsuura, S., Bunno, M., Kurosawa, M. (2002) Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferroanthophyllite from Cheyenne Canyon and Cheyenne Mountain, U.S.A. and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of Mineralogical and Petrological Sciences: 97: 127-136.

Hawthorne, F.C., Oberti, R. (2006) On the classification of amphiboles. The Canadian Mineralogist: 44: 1-21.

Hawthorne, F.C., Oberti, R., Harlow, G.E., Maresch, W.V., Martin, R.F., Schumacher, J.C., Welch, M.D. (2012) Nomenclature of the amphibole supergroup. American Mineralogist: 97: 2031-2048.

Internet Links for Proto-ferro-suenoite

Localities for Proto-ferro-suenoite

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.
Japan (TL)
 
  • Honshu Island
    • Kanto Region
      • Tochigi Prefecture
        • Kanuma City
          • Awano
AmMin 84:196; Journal of Mineralogical and Petrological Sciences: 97: 127-136.; Sueno, S., Matsuura, S., Bunno, M., & Kurosawa, M. (2002). Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, USA and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of mineralogical and petrological sciences, 97(4), 127-136.
Yamada, S. (2004) Nihonsan-koubutsu Gojuon-hairetsu Sanchi-ichiranhyou (111 pp.)
    • Tohoku Region
      • Fukushima Prefecture
        • Kawamata
          • Iizaka Village (Iisaka)
Am.Min. 84: 196; Lapis 2002(11): 12; Journal of Mineralogical and Petrological Sciences: 97: 127-136.; Sueno, S., Matsuura, S., Bunno, M., & Kurosawa, M. (2002). Occurrence and crystal chemical features of protoferro-anthophyllite and protomangano-ferro-anthophyllite from Cheyenne Canyon and Cheyenne Mountain, USA and Hirukawa-mura, Suisho-yama, and Yokone-yama, Japan. Journal of mineralogical and petrological sciences, 97(4), 127-136.
Mineral and/or Locality  
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