Brindleyite Mineral Data

Brindleyite Mineral Data +

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General Brindleyite Information

Chemical Formula:

(Ni,Mg,Fe++)2Al(SiAl)O5(OH)4

Composition:

Molecular Weight = 340.29 gm

Magnesium 1.43 % Mg 2.37 % MgO

Aluminum 15.86 % Al 29.96 % Al₂O₃

Iron 1.64 % Fe 2.11 % FeO

Silicon 8.25 % Si 17.66 % SiO₂

Nickel 29.32 % Ni 37.31 % NiO

Hydrogen 1.18 % H 10.59 % H₂O

Oxygen 42.31 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ni_1.7Mg_0.2Fe²⁺_0.1Al₂SiO₅(OH)₄

Environment:

As coatings on clays and as veinlets cutting kaolinitic clay at the base of a bauxite deposit developed on karst.

IMA Status:

Approved IMA 1978

Locality:

Marmara bauxite deposit, Begara, Greece. Link to MinDat.org Location Data.

Name Origin:

Name for Dr. George William Brindley (1905-1983), Professor of Mineral Sciences, Pennsylvania State University, University Park, Pennsylvania, USA.

Synonym:

Nimesite

Brindleyite Image

Images:

Brindleyite

Comments: Greenish waxy crust of brindleyite.
Location: Hachita, Grant County, New Mexico, USA. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Brindleyite Crystallography

Axial Ratios:

a:b:c =0.5787:1:0.8003

Cell Dimensions:

a = 5.286, b = 9.133, c = 7.31, Z = 2; beta = 104.15° V = 342.20 Den(Calc)= 3.30

Crystal System:

Monoclinic - SphenoidalH-M Symbol (2) Space Group: C 2

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

By Intensity(I/I_o): 7.07(1), 3.54(0.81), 2.48(0.18),2.62(0.18), 1.524(0.17), 4.54(0.1),

Physical Properties of Brindleyite

Cleavage:

None

Color:

Yellow green.

Density:

3.17

Diaphaniety:

Transparent to Translucent

Habit:

Massive - Uniformly indistinguishable crystals forming large masses.

Habit:

Platy - Sheet forms (e.g. micas).

Hardness:

2.5-3 - Finger Nail-Calcite

Luster:

Vitreous - Pearly

Streak:

light green

Optical Properties of Brindleyite

Gladstone-Dale:

CI meas= 0.042 (Good) - where the CI = (1-KPDmeas/KC)
CI calc= 0.08 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.1924,KPDmeas= 0.2003,KC= 0.2091

Optical Data:

Biaxial (?), b=1.635

Calculated Properties of Brindleyite

Electron Density:

r_electron=3.14 gm/cc
note: r_Brindleyite=3.17 gm/cc.

Fermion Index

Fermion Index = 0.00914
Boson Index = 0.99086

Photoelectric:

PE_Brindleyite= 12.81 barns/electron
U=PE_Brindleyite x r_electron= 40.24 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Brindleyite is Not Radioactive

Brindleyite Classification

Dana Class:

71.1.2c.3 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.1)with 1:1 layers

(71.1.2c)Serpentine group (Amesite subgroup)

71.1.2c.1 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

71.1.2c.2 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

71.1.2c.3 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

71.1.2c.4 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

71.1.2c.5 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

71.1.2c.6 Manandonite Li2Al4[(Si2AlB)O10](OH)8 C1 1

71.1.2c.7 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

Strunz Class:

VIII/H.27-170 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.27 - Serpentine group

VIII/H.27-10 Antigorite (Mg,Fe)3Si2O5(OH)4 Cm m

VIII/H.27-20 Lizardite Mg3Si2O5(OH)4 P1 1

VIII/H.27-30 Clinochrysotile Mg3Si2O5(OH)4 Cc, C 2/m Mono

VIII/H.27-40 Orthochrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-50 Parachrysotile Mg3Si2O5(OH)4 Unk Ortho

VIII/H.27-55 Caryopilite (Mn,Mg,Zn,Fe)3(Si,As)2O510(OH,Cl)4 Cm or C 2/m Mono

VIII/H.27-60 Greenalite (Fe,Fe)2-3Si2O5(OH)4 Unk Mono

VIII/H.27-70 Berthierine (Fe,Fe,Al,Mg)2-3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-80 Fraipontite (Zn,Al)3(Si,Al)2O5(OH)4 Cm m

VIII/H.27-90 Zinalsite Zn2AlSi2O5(OH)4·2(H2O)(?) Mono

VIII/H.27-95 Dozyite (Mg7Al2)(Si4Al2)O15(OH)12 Cm m

VIII/H.27-100 Amesite Mg2Al(SiAl)O5(OH)4 C1 1

VIII/H.27-110 Kellyite (Mn,Mg,Al)3(Si,Al)2O5(OH)4 P 6₃ 6

VIII/H.27-120 Cronstedtite Fe2Fe(SiFe)O5(OH)4 P 3₁m 3m

VIII/H.27-140 Karpinskite (Mg,Ni)2Si2O5(OH)2(?) Unk Mono

VIII/H.27-150 Nepouite Ni3Si2O5(OH)4 Ccm21 mm2

VIII/H.27-160 Pecoraite Ni3Si2O5(OH)4 C 2/m 2/m

VIII/H.27-170 Brindleyite (Ni,Mg,Fe)2Al(SiAl)O5(OH)4 C 2 2

VIII/H.27-180 Maufite (Mg,Ni)Al4Si3O13·4(H2O)(?) Mono ? Mono

VIII/H.27-190 Carlosturanite (Mg,Fe,Ti,Mn)21(Si,Al)12O28(OH)34 Cm m

Other Brindleyite Information

References:

NAME( AntBidBlaNic2) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)

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Brindleyite

(Ni,Mg,Fe++)2Al(SiAl)O5(OH)4
Dana No: 71.1.2c.3 Strunz No: VIII/H.27-170
Locality:

Notes: