Proto-anthophyllite
A valid IMA mineral species
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About Proto-anthophyllite
Formula:
◻Mg2Mg5(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.
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
Member of:
Name:
Named for being a protoamphibole polymorph of Anthophyllite.
Dimorph of:
This page provides mineralogical data about Proto-anthophyllite.
Unique Identifiers
Mindat ID:
11477
Long-form identifier:
mindat:1:1:11477:0
IMA Classification of Proto-anthophyllite
Classification of Proto-anthophyllite
9.DD.05
9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
9 : SILICATES (Germanates)
D : Inosilicates
D : Inosilicates with 2-periodic double chains, Si4O11; Orthoamphiboles
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Path | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Proto-anthophyllite
Vitreous
Transparency:
Transparent
Colour:
Colourless to white
Streak:
White
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
Perfect
on {110}
on {110}
Density:
2.98 g/cm3 (Measured)
Chemistry of Proto-anthophyllite
Mindat Formula:
◻Mg2Mg5(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.
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.
Element Weights:
Elements listed:
Common Impurities:
Na,Mn,Ni,Al
Crystallography of Proto-anthophyllite
Crystal System:
Orthorhombic
Class (H-M):
mmm(2/m2/m2/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]
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0003184 | Proto-anthophyllite | Konishi H, Groy T L, Dodony I, Miyawaki R, Matsubara S, Buseck P R (2003) Crystal structure of protoanthophyllite: A new mineral from the Takese ultramafic complex, Japan American Mineralogist 88 1718-1723 |  | 2003 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 8.32 Å | (70) |
| 3.66 Å | (100) |
| 3.08 Å | (80) |
| 2.84 Å | (85) |
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 7 : Ultramafic igneous rocks | |
| Stage 5: Initiation of plate tectonics | <3.5-2.5 |
| 40 : Regional metamorphism (greenschist, amphibolite, granulite facies) |
Geological Setting:
metamorphosed serpentinites
Type Occurrence of Proto-anthophyllite
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-anthophyllite
Relationship of Proto-anthophyllite to other Species
Member of:
Other Members of Anthophyllite Root Name Group:
| Anthophyllite | ◻Mg2Mg5(Si8O22)(OH)2 | Orth. mmm(2/m2/m2/m) : Pnma |
| Ferro-anthophyllite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 | Orth. mmm(2/m2/m2/m) : Pnma |
| Proto-ferro-anthophyllite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 | Orth. mmm(2/m2/m2/m) |
| 'Sodic-ferro-anthophyllite' | NaFe2+2Fe2+5(AlSi7O22)(OH)2 | Orth. |
Common Associates
Associations Based on Photo Data:
| 3 photos of Proto-anthophyllite associated with Serpentine Subgroup | D3[Si2O5](OH)4 |
Related Minerals - Strunz-mindat Grouping
| 9.DD.05 | Suenoite | ◻Mn2+2Mg5Si8O22(OH)2 |
| 9.DD.05 | Proto-ferro-anthophyllite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 9.DD.05 | Proto-ferro-suenoite | ◻Mn2+2(Fe2+5)(Si8O22)(OH)2 |
| 9.DD.05 | Papikeite | NaMg2(Mg3Al2}(Al3Si5O22)(OH)2 |
| 9.DD.05 | Gedrite | ◻Mg2(Mg3Al2)(Al2Si6O22)(OH)2 |
| 9.DD.05 | Holmquistite | ◻Li2(Mg3Al2)(Si8O22)(OH)2 |
| 9.DD.05 | 'Sodic-anthophyllite' | {Na}{Mg2}{Mg5}(AlSi7O22)(OH)2 |
| 9.DD.05 | 'Sodic-ferro-anthophyllite' | NaFe2+2Fe2+5(AlSi7O22)(OH)2 |
| 9.DD.05 | Ferro-papikeite | NaFe2+2(Fe2+3Al2)(Si5Al3O22)(OH)2 |
| 9.DD.05 | Ferro-anthophyllite | ◻Fe2+2Fe2+5(Si8O22)(OH)2 |
| 9.DD.05 | Ferro-gedrite | ◻Fe2+2(Fe2+3Al2)(Al2Si6O22)(OH)2 |
| 9.DD.05 | 'Ferri-holmquistite' | ◻{Li2}{Mg3Fe3+2}(Si8O22)(OH)2 |
| 9.DD.05 | Ferro-ferri-holmquistite | ◻Li2(Fe2+3Fe3+2)(Si8O22)(OH)2 |
| 9.DD.05 | Ferro-holmquistite | ◻Li2(Fe2+3Al2)(Si8O22)(OH)2 |
| 9.DD.05 | Anthophyllite | ◻Mg2Mg5(Si8O22)(OH)2 |
Fluorescence of Proto-anthophyllite
none
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.
Internet Links for Proto-anthophyllite
mindat.org URL:
https://www.mindat.org/min-11477.html
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References for Proto-anthophyllite
Reference List:
Sueno, Shigeho, Matsuura, Shigeru, Gibbs, G. V., Boisen Jr., M. B. (1998) A crystal chemical study of protoanthophyllite: orthoamphiboles with the protoamphibole structure. Physics and Chemistry of Minerals, 25 (5) 366-377 doi:10.1007/s002690050126
Konishi, Hiromi, Dódony, István, Buseck, Peter R. (2002) Protoanthophyllite from three metamorphosed serpentinites. American Mineralogist, 87 (8) 1096-1103 doi:10.2138/am-2002-8-906
Konishi, Hiromi, Groy, Thomas L., Dódony, István, Miyawaki, Ritsuro, Matsubara, Satoshi, Buseck, Peter R. (2003) Crystal structure of protoanthophyllite: A new mineral from the Takase ultramafic complex, Japan. American Mineralogist, 88 (11-12). 1718-1723 doi:10.2138/am-2003-11-1212
Localities for Proto-anthophyllite
Showing 4 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Japan | |
| Konishi et al. (2002) +1 other reference |
| Konishi et al. (2003) |
| Konishi et al. (2002) +1 other reference |
USA | |
| Hanson et al. (2013) |
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Takase mine, Shingo-takase, Niimi City, Okayama Prefecture, Japan