Ferripedrizite Mineral Data

General Ferripedrizite Information

Chemical Formula:

NaLi2(Fe+++2Mg2Li)Si8O22(OH)2

Composition:

Molecular Weight = 839.32 gm

Potassium 0.19 % K 0.22 % K₂O

Sodium 2.11 % Na 2.84 % Na₂O

Lithium 1.94 % Li 4.17 % Li₂O

Calcium 0.24 % Ca 0.33 % CaO

Magnesium 4.31 % Mg 7.16 % MgO

Titanium 0.51 % Ti 0.86 % TiO₂

Manganese 0.46 % Mn 0.59 % MnO

Aluminum 0.68 % Al 1.28 % Al₂O₃

Zinc 0.08 % Zn 0.10 % ZnO

Iron 16.57 % Fe 7.28 % FeO / 15.60 % Fe₂O₃

Silicon 26.77 % Si 57.27 % SiO₂

Hydrogen 0.16 % H 1.41 % H₂O

Oxygen 44.43 % O

Fluorine 1.56 % F 1.56 % F

- % F -0.66 % -O=F₂

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

K_0.04Na_0.52Na_0.25Ca_0.05Li_1.7Li_0.64Fe³⁺_1.64Mg_1.49Fe²⁺_0.85Al_0.21Ti_0.09Mn²⁺_0.07Zn_0.01 Si₈O₂₂(OH)_1.31F_0.69

Environment:

Episyenites (non-magmatic hydrothermal rocks) replacing cordierite-bearing monzogranites. Related to Sodic-ferripedrizite as it is the higher temperature phase.

IMA Status:

Approved IMA 2001 (Dana # Added)

Locality:

Eastern Pedriza Massif, Arroyo de la Yedra Valley, Sierra de Guadarrama, Spain. Link to MinDat.org Location Data.

Name Origin:

Named for the locality and as the ferric end member from the IMA-CNMMN and its Amphibole Subcommittee.

Synonym:

IMA2001-032

Ferripedrizite Image

Images:

Ferripedrizite

Comments: Black, bladed ferripedrizite crystals.
Location: East Pedriza Massif, Sierra de Guadarrama, Spain. Scale: See Image.
© Rruff Database

Ferripedrizite Crystallography

Axial Ratios:

a:b:c =0.5317:1:0.2962

Cell Dimensions:

a = 9.501, b = 17.866, c = 5.292, Z = 2; beta = 102.17° V = 878.10 Den(Calc)= 3.17

Crystal System:

Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m

$Help on X Ray Diffraction:$ X Ray Diffraction:

By Intensity(I/I_o): 3.05(1)(310), 1.642(0.4)(461), 2.711(0.4)(151),1.394(0.3)(661), 2.747(0.3)(330), 8.251(0.3)(110), 2.161(0.2)(261), 2.495(0.2)(202),

Physical Properties of Ferripedrizite

Cleavage:

{110} Perfect

Color:

Black.

Diaphaneity:

Translucent

Fracture:

Brittle - Uneven - Very brittle fracture producing uneven fragments.

Habit:

Aggregates - Made of numerous individual crystals or clusters.

Habit:

Inclusions - Generally found as inclusions in other minerals.

Habit:

Microscopic Crystals - Crystals visible only with microscopes.

Hardness:

6 - Orthoclase

Luster:

Vitreous (Glassy)

Streak:

gray

Optical Properties of Ferripedrizite

Gladstone-Dale:

CI calc= 0.035 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2205,KC= 0.2284
Ncalc = 1.72

Optical Data:

Biaxial (-), a=1.695, b=1.7, g=1.702, bire=0.0070, 2V(Calc)=64, 2V(Meas)=55. Dispersion r > v.

Calculated Properties of Ferripedrizite

Electron Density:

Bulk Density (Electron Density)=3.12 gm/cc
note: Specific Gravity of Ferripedrizite =3.17 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_{Ferripedrizite}= 6.40 barns/electron
U=PE_{Ferripedrizite} x r_electron= 19.94 barns/cc.

Radioactivity:

GRapi = 2.62 (Gamma Ray American Petroleum Institute Units)
Concentration of Ferripedrizite per GRapi unit = 38.14 (%)

Estimated Radioactivity from Ferripedrizite - barely detectable

Ferripedrizite Classification

Dana Class:

66.01.01.09a (66)Inosilicate Double-Width Unbranched Chains, W=2

(66.01)with P=2 amphibole configuration

(66.01.01)Group 1, the Mg-Fe-Mn-Li amphiboles (Monoclinic)

66.01.01.01 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

66.01.01.02 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

66.01.01.03 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

66.01.01.03b Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

66.01.01.04 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

66.01.01.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

66.01.01.06 Magnesioclinoholmquistite? Li2(Mg,Fe)3Al2Si8O22(OH)2 C 2/m 2/m

66.01.01.07 Clinoholmquistite? [](Li2Mg3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.01.08 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

66.01.01.08a Ferri-clinoholmquistite! []Li2Mg3(Fe3)2(Si8O22)(OH)2 C 2/m 2/m

66.01.01.08b Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

66.01.01.09a Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

66.01.01.09b Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

66.01.01.09c Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

Strunz Class:

09.DE.05 09 - SILICATES (Germanates)

09.D - Inosilicates* Structural terminology according to Liebau (1985)

09.DE -Inosilicates with 2-periodic double chains, Si4O11; amphibole family

09.DE.05 Ferro-anthophyllite []Fe7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Anthophyllite []Mg7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Ferrogedrite []Fe5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Gedrite []Mg5Al2Si6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Ferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Holmquistite [](Li2Mg3Al2)Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Cummingtonite []Mg7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Clinoferroholmquistite [](Li2Fe3Al2)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Grunerite []Fe7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Magnesiocummingtonite (Mg,Fe)7Si8O22(OH)2 C 2/m 2/m

09.DE.05 Manganogrunerite []Mn2Fe5Si8O22(OH) C 2/m 2/m

09.DE.05 Magnesioanthophyllite? (Mg,Fe)7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Protomangano-ferro-anthophyllite! (Mn,Fe)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Sodicgedrite NaMg6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodic-ferro-anthophyllite! NaFe7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodic-ferrogedrite! NaFe6AlSi6Al2O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Sodicanthophyllite NaMg7Si8O22(OH)2 P nma 2/m 2/m 2/m

09.DE.05 Permanganogrunerite! []Mn4(Fe)3(Si8O22)(OH)2 C 2/m 2/m

09.DE.05 Protoferro-anthophyllite! (Fe,Mn)2(Fe,Mg)5(Si4O11)2(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Fluoro-sodic-pedrizite! NaLi2(Mg2Al2Li)S5Si8O22F2 C 2/m 2/m

09.DE.05 Sodic-ferri-ferropedrizite! NaLi2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Manganocummingtonite Na(Na,Mn)2(Mg4,Fe)5Si8O22(OH)2 C 2/m 2/m

09.DE.05 Protoanthophyllite! (Mg,Fe)7Si8O22(OH)2 Pnmn 2/m 2/m 2/m

09.DE.05 Ferri-clinoferroholmquistite! []Li2(Fe2Fe3)Si8O22(OH)2 C 2/m 2/m

09.DE.05 Sodic-ferripedrizite! Na(LiNa)(Fe2Mg2Li)Si8O22(OH,F)2 C 2/m 2/m

09.DE.05 Ferripedrizite! NaLi2(Fe2Mg2Li)Si8O22(OH)2 C 2/m 2/m

Other Ferripedrizite Information

References:

NAME( AmMin, 87:976) PHYS. PROP.(AmMin, 87:976) OPTIC PROP.(AmMin, 87:976)

See Also:

Links to other databases for Ferripedrizite :
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 Ferripedrizite Specimen Label here :

Ferripedrizite

NaLi2(Fe+++2Mg2Li)Si8O22(OH)2
Dana No: 66.01.01.09a Strunz No: 09.DE.05
Locality:

Notes:

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