IMPORTANT MESSAGE. We need your support now to keep mindat.org running. Click here to find out why.
Log InRegister
Home PageAbout MindatThe Mindat ManualHistory of MindatCopyright StatusWho We AreContact UsAdvertise on Mindat
Donate to MindatCorporate SponsorshipSponsor a PageSponsored PagesMindat AdvertisersAdvertise on Mindat
Learning CenterWhat is a mineral?The most common minerals on earthInformation for Educators
Minerals by PropertiesMinerals by ChemistryAdvanced Locality SearchRandom MineralRandom LocalitySearch by minIDLocalities Near MeSearch ArticlesSearch GlossaryMore Search Options
Search For:
Mineral Name:
Locality Name:
Keyword(s):
 
The Mindat ManualAdd a New PhotoRate PhotosLocality Edit ReportCoordinate Completion ReportAdd Glossary Item
StatisticsThe ElementsUsersBooks & MagazinesMineral MuseumsMineral Shows & EventsThe Mindat DirectoryDevice Settings
Photo SearchPhoto GalleriesNew Photos TodayNew Photos YesterdayMembers' Photo GalleriesPast Photo of the Day Gallery

Proto-anthophyllite

This page is currently not sponsored. Click here to sponsor this page.
Hide all sections | Show all sections

About Proto-anthophylliteHide

Formula:
☐{Mg2}{Mg5}(Si8O22)(OH)2
The anthophyllite group 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 anthophyllite group's composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Proto-anthophyllite is defined with Pnmm symmetry and Mg as the dominant element both in the B and C positions.
Colour:
colourless to white
Lustre:
Vitreous
Hardness:
6
Specific Gravity:
2.98
Crystal System:
Orthorhombic
Name:
Named for being a protoamphibole polymorph of Anthophyllite.
Dimorph of:
This page provides mineralogical data about Proto-anthophyllite.


Classification of Proto-anthophylliteHide

Approved
Approval Year:
2001
8/F.12-140
9.DD.05

9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles

Physical Properties of Proto-anthophylliteHide

Vitreous
Transparency:
Transparent
Colour:
colourless to white
Streak:
white
Hardness:
Tenacity:
Brittle
Cleavage:
Perfect
on {110}
Density:
2.98 g/cm3 (Measured)    

Chemical Properties of Proto-anthophylliteHide

Formula:
☐{Mg2}{Mg5}(Si8O22)(OH)2

The anthophyllite group 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 anthophyllite group's composition is defined with A(Na+K+2Ca)<0.5 apfu and C(Al+Fe3++2Ti)<1 apfu.

Proto-anthophyllite is defined with Pnmm symmetry and Mg as the dominant element both in the B and C positions.
IMA Formula:
◻Mg2Mg5Si8O22(OH)2
Common Impurities:
Na,Mn,Ni,Al

Crystallography of Proto-anthophylliteHide

Crystal System:
Orthorhombic
Class (H-M):
mmm (2/m 2/m 2/m) - Dipyramidal
Space Group:
Pnnm
Cell Parameters:
a = 9.355 Å, b = 17.93 Å, c = 5.311 Å
Ratio:
a:b:c = 0.522 : 1 : 0.296
Unit Cell V:
890.84 ų (Calculated from Unit Cell)
Morphology:
prismatic crystals, elongated parallel to [001]

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
8.32 (70)
3.66 (100)
3.08 (80)
2.84 (85)

Occurrences of Proto-anthophylliteHide

Type Occurrence of Proto-anthophylliteHide

General Appearance of Type Material:
acicular prisms to 10 mm
Place of Conservation of Type Material:
Natural Science Museum, Tokyo
Geological Setting of Type Material:
contact-metamorphosed serpentinite
Associated Minerals at Type Locality:

Other Language Names for Proto-anthophylliteHide

Relationship of Proto-anthophyllite to other SpeciesHide

Other Members of this group:
Anthophyllite☐{Mg2}{Mg5}(Si8O22)(OH)2Orth. mmm (2/m 2/m 2/m) : Pnma
Ferro-anthophyllite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth.
Proto-ferro-anthophyllite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth.

Related Minerals - Nickel-Strunz GroupingHide

9.DD.05Ferro-anthophyllite☐{Fe2+2}{Fe2+5}(Si8O22)(OH)2Orth.
9.DD.05Ferro-gedrite☐{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2Orth.
9.DD.05Gedrite☐{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2Orth.
9.DD.05Holmquistite☐{Li2}{Mg3Al2}(Si8O22)(OH)2Orth.
9.DD.05Proto-ferro-suenoite☐{Mn2+2}{Fe2+5}(Si8O22)(OH)2Orth.
9.DD.05Sodicanthophyllite{Na}{Mg2}{Mg5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferro-anthophyllite{Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2Orth.
9.DD.05Sodic-ferrogedrite{Na}{Fe2+2}{Fe2+3Al2}(Al3Si5O22)(OH)2Orth.
9.DD.05Sodicgedrite{Na}{Mg2}{Mg3Al2}(Al3Si5O22)(OH)2Orth.
9.DD.05Ferro-holmquistite☐{Li2}{Fe2+3Al2}(Si8O22)(OH)2Orth.

Fluorescence of Proto-anthophylliteHide

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 Proto-anthophylliteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Sueno, S., Matsuura, S., Gibbs, G.V., Boisen, M.B., Jr. (1998) A crystal chemical study of protoanthophyllite: orthoamphiboles with the protoamphibole structure. Physics and Chemistry of Minerals: 25: 366-377.
Konishi, H., Dódony, I., Buseck, P.R. (2002) Protoanthophyllite from three metamorphosed serpentinites. American Mineralogist: 87: 1096-1103.
Konishi, H., Groy, T.L., Dódony, I., Miyawaki, R., Matsubara, S., Buseck, P. (2003) Crystal structure of protoanthophyllite: A new mineral from the Takase ultramafic complex, Japan. American Mineralogist: 88: 1718-1723.
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-anthophylliteHide

Localities for Proto-anthophylliteHide

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.
Japan (TL)
 
  • Honshu Island
    • Chugoku Region
      • Okayama Prefecture
        • Niimi City
          • Shingo-takase
Konishi, H., et al. (2003): Am.Min. 88, 1718–1723
Lapis 29(1), 47 (2004)
    • Tohoku Region
      • Iwate Prefecture
        • Kitakami Mts
Lapis 29(1), 47 (2004)
USA
 
  • Colorado
    • El Paso Co.
Hanson, S.L. and Zito, G. (2013) Mineralogy of Miarolitic Pegmatites in the Stove Mountain Area, Colorado. The 40th Rochester Mineralogical Symposium, Contributed Papers in Specimen Mineralogy, 14-15.
Mineral and/or Locality  
Mindat.org is an outreach project of the Hudson Institute of Mineralogy, a 501(c)(3) not-for-profit organization.
Copyright © mindat.org and the Hudson Institute of Mineralogy 1993-2018, except where stated. Mindat.org relies on the contributions of thousands of members and supporters.
Privacy Policy - Terms & Conditions - Contact Us Current server date and time: October 24, 2018 05:51:19 Page generated: October 8, 2018 07:08:32
Go to top of page