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Protoanthophyllite Mineral Data
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General Protoanthophyllite Information
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Chemical Formula: |
(Mg,Fe)7Si8O22(OH)2 |
Composition: |
Molecular Weight = 801.60 gm |
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Sodium 0.17 % Na 0.23 % Na2O |
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Magnesium 19.13 % Mg 31.73 % MgO |
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Manganese 0.07 % Mn 0.09 % MnO |
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Aluminum 0.47 % Al 0.89 % Al2O3 |
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Iron 4.25 % Fe 5.47 % FeO |
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Silicon 27.68 % Si 59.21 % SiO2 |
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Nickel 0.07 % Ni 0.09 % NiO |
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Hydrogen 0.25 % H 2.25 % H2O |
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Oxygen 47.90 % O |
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______ ______ |
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100.00 % 99.96 % = TOTAL OXIDE |
Empirical Formula: |
Mg6.31Fe2+0.61Na0.06Mn2+0.01Ni0.01Si7.9Al0.14O22(OH)2 |
Environment: |
Contact metamorphosed Takase ultramafic complex (serpentinites). |
IMA Status: |
Approved IMA 2003 (Dana # Added) |
Locality: |
Drill-core sample from the waste dump of the abandoned Takase chromite mine, Okayama Prefecture, Japan. Link to MinDat.org Location Data. |
Name Origin: |
Named as the proto-type analog of anthophyllite. The prefix proto refers to a half-rotation about the b axis between successive layers of octahedra. |
Synonym: |
IMA2001-065 |
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Protoanthophyllite Image |
Images:
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Protoanthophyllite
Comments: Drill core showing white acicular crystalline aggregates of protoanthophyllite in matrix with a close up image on the right..
Location: Drill-core sample from the waste dump of the abandoned Takase chromite mine, Okayama Prefecture, Japan.
Scale: Core size 3 cm.
© American Mineralogist |
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Protoanthophyllite Crystallography
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Axial Ratios: |
a:b:c =0.5217:1:0.2962 |
Cell Dimensions: |
a = 9.3553, b = 17.9308, c = 5.3117, Z = 2; V = 891.03 Den(Calc)= 2.99 |
Crystal System: |
Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: Pnmn |
X Ray Diffraction: |
By Intensity(I/Io): 3.66(1)(131), 3.08(0.81)(310), 8.32(0.71)(110),2.51(0.57)(202), 2.56(0.49)(102), 3.27(0.49)(221), |
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Physical Properties of Protoanthophyllite
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Cleavage: |
{110} Perfect, {110} Perfect |
Color: |
Colorless, White. |
Diaphaneity: |
Transparent |
Fracture: |
Brittle - Uneven - Very brittle fracture producing uneven fragments. |
Habit: |
Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline). |
Hardness: |
6 - Orthoclase |
Luster: |
Vitreous (Glassy) |
Streak: |
white |
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Optical Properties of Protoanthophyllite
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Gladstone-Dale: |
CI calc= 0.022 (Excellent) - where the CI = (1-KPDcalc/KC) KPDcalc= 0.2026,KC= 0.2072 Ncalc = 1.62 |
Optical Data: |
Biaxial (-), a=1.593, b=1.609, g=1.615, bire=0.0220 |
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Calculated Properties of Protoanthophyllite
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Electron Density: |
Bulk Density (Electron Density)=2.98 gm/cc note: Specific Gravity of Protoanthophyllite =2.99 gm/cc. |
Fermion Index: |
Fermion Index = 0.03 Boson Index = 0.97 |
Photoelectric: |
PEProtoanthophyllite = 2.80 barns/electron U=PEProtoanthophyllite x rElectron Density= 8.33 barns/cc. |
Radioactivity: |
GRapi = 0 (Gamma Ray American Petroleum Institute Units) Protoanthophyllite is Not Radioactive |
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Protoanthophyllite Classification
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Dana Class: |
66.01.02.02a (66)Inosilicate Double-Width Unbranched Chains, W=2 |
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(66.01)with P=2 amphibole configuration |
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(66.01.02)Dana Group |
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66.01.02.01 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.02 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.02a Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m |
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66.01.02.03 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.03a Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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66.01.02.03b Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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66.01.02.04 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.04a Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.05 Magnesiogedrite? (Mg,Fe)5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.06 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.07 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.07a Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.08 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.09 Magnesioholmquistite Li2(Mg,Fe)3Al2Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.10 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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66.01.02.11 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
Strunz Class: |
09.DE.05 09 - SILICATES (Germanates) |
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09.D - Inosilicates* Structural terminology according to Liebau (1985) |
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09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family |
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09.DE.05 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m |
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09.DE.05 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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09.DE.05 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m |
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09.DE.05 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m |
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09.DE.05 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m |
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09.DE.05 Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m |
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09.DE.05 Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m |
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09.DE.05 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m |
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09.DE.05 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m |
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09.DE.05 Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m |
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Other Protoanthophyllite Information
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References: |
NAME( AmMin, v 88, p 1718) PHYS. PROP.(AmMin, v 88, p 1718) OPTIC PROP.(AmMin, v 88, p 1718) |
See Also: |
Links to other databases for Protoanthophyllite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - GeoScienceWorld
4 - Google Images
5 - Google Scholar
6 - MinDAT
7 - Mineralienatlas (Deutsch)
8 - Online Mineral Museum
9 - QUT Mineral Atlas
10 - Ruff.Info
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Print or Cut-and-Paste your Protoanthophyllite Specimen Label here :
Protoanthophyllite
(Mg,Fe)7Si8O22(OH)2
Dana No: 66.01.02.02a Strunz No: 09.DE.05
Locality:
Notes:
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