Proto-anthophyllite
A valid IMA mineral species
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About Proto-anthophyllite
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.
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
GUID
(UUID V4):
(UUID V4):
77c9efb3-9585-424b-a519-5366a3b295ad
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 |
---|---|---|
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:
◻{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.
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.
Elements listed:
Common Impurities:
Na,Mn,Ni,Al
Crystallography of Proto-anthophyllite
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]
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 this group:
Anthophyllite | ◻{Mg2}{Mg5}(Si8O22)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
Ferro-anthophyllite | ◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2 | Orth. mmm (2/m 2/m 2/m) : Pnma |
Proto-ferro-anthophyllite | ◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2 | Orth. mmm (2/m 2/m 2/m) |
Sodic-ferro-anthophyllite | {Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2 | Orth. |
Common Associates
Associated Minerals Based on Photo Data:
3 photos of Proto-anthophyllite associated with Serpentine Subgroup | D3[Si2O5](OH)4 |
3 photos of Proto-anthophyllite associated with Chromite | Fe2+Cr3+2O4 |
Related Minerals - Strunz-mindat Grouping
9.DD.05 | Anthophyllite | ◻{Mg2}{Mg5}(Si8O22)(OH)2 |
9.DD.05 | Ferro-anthophyllite | ◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2 |
9.DD.05 | Ferro-gedrite | ◻{Fe2+2}{Fe2+3Al2}(Al2Si6O22)(OH)2 |
9.DD.05 | Gedrite | ◻{Mg2}{Mg3Al2}(Al2Si6O22)(OH)2 |
9.DD.05 | Holmquistite | ◻{Li2}{Mg3Al2}(Si8O22)(OH)2 |
9.DD.05 | Proto-ferro-anthophyllite | ◻{Fe2+2}{Fe2+5}(Si8O22)(OH)2 |
9.DD.05 | Proto-ferro-suenoite | ◻{Mn2+2}{Fe2+5}(Si8O22)(OH)2 |
9.DD.05 | Sodic-anthophyllite | {Na}{Mg2}{Mg5}(AlSi7O22)(OH)2 |
9.DD.05 | Sodic-ferro-anthophyllite | {Na}{Fe2+2}{Fe2+5}(AlSi7O22)(OH)2 |
9.DD.05 | Ferro-holmquistite | ◻{Li2}{Fe2+3Al2}(Si8O22)(OH)2 |
9.DD.05 | Lavinskyite | K(LiCu)Cu6(Si4O11)2(OH)4 |
9.DD.05 | Papikeite | NaMg2(Mg3Al2}(Al3Si5O22)(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 | Suenoite | ◻Mn2Mg5Si8O22(OH)2 |
9.DD.05 | Ferro-papikeite | NaFe2+2(Fe2+3Al2)(Si5Al3O22)(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
Localities for Proto-anthophyllite
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).
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 (e.g. from pseudomorphs).
All localities listed without proper references should be considered as questionable.
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