Santaclaraite Mineral Data

Santaclaraite Mineral Data +

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General Santaclaraite Information

Chemical Formula:

CaMn++4Si5O14(OH)2·(H2O)

Composition:

Molecular Weight = 676.28 gm

Calcium 5.93 % Ca 8.29 % CaO

Manganese 32.49 % Mn 41.96 % MnO

Silicon 20.76 % Si 44.42 % SiO₂

Hydrogen 0.60 % H 5.33 % H₂O

Oxygen 40.22 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

CaMn²⁺₄Si₅O₁₄(OH)₂·(H₂O)

IMA Status:

Approved IMA 1981

Locality:

Pennsylvania mine, SW side of San Antonio Valley, 4 miles ENE of Mount Hamilton, Santa Clara Co., California. Link to MinDat.org Location Data.

Name Origin:

Named after it's locality.

Santaclaraite Image

Images:

Santaclaraite

Comments: Flesh-colored crystalline aggregates of Santaclaraite.
Location: Corral Hollow, Alemada County, California, USA. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Santaclaraite Crystallography

Axial Ratios:

a:b:c =2.0561:1:1.5787

Cell Dimensions:

a = 15.633, b = 7.603, c = 12.003, Z = 4; alpha = 109.71°, beta = 88.61°, gamma = 99.95° V = 1,322.47 Den(Calc)= 3.40

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 7.04(1), 3.003(0.84), 3.152(0.8),

Crystal Structure:

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Ohashi Y , Finger L W , American Mineralogist , 66 (1981) p.154-168, The crystal structure of santaclaraite, CaMn4[Si5O14(OH)](OH)*H2O: The role of, hydrogen atoms in the pyroxenoid structure

Physical Properties of Santaclaraite

Cleavage:

[100] Good, [010] Good

Color:

Light pink, Reddish orange.

Density:

3.31

Diaphaniety:

Transparent to Translucent

Hardness:

6.5 - Pyrite

Luster:

Vitreous (Glassy)

Streak:

light pink

Optical Properties of Santaclaraite

Gladstone-Dale:

CI meas= 0.003 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.029 (Excellent) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2044,KPDmeas= 0.21,KC= 0.2106

Optical Data:

Biaxial (-), a=1.681, b=1.696, g=1.708, bire=0.0270, 2V(Calc)=82, 2V(Meas)=83.

Calculated Properties of Santaclaraite

Electron Density:

r_electron=3.23 gm/cc
note: r_{Santaclaraite}=3.31 gm/cc.

Fermion Index

Fermion Index = 0.00997
Boson Index = 0.99003

Photoelectric:

PE_{Santaclaraite}= 9.79 barns/electron
U=PE_{Santaclaraite} x r_electron= 31.62 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Santaclaraite is Not Radioactive

Santaclaraite Classification

Dana Class:

65.4.2.1 (65)Inosilicate Single-Width Unbranched Chains, W=1

(65.4)with chains P=5

(65.4.2)Dana Group

65.4.2.1 Santaclaraite CaMn4Si5O14(OH)2·(H2O) P1 1

Strunz Class:

VIII/F.27-40 VIII - Silicates

VIII/F - Inosilicates (chain and band) Five chains [Si5O15]10-

VIII/F.27 - Rhodonite - Inesite series

VIII/F.27-10 Rhodonite (Mn,Fe,Mg,Ca)SiO3 P1 1

VIII/F.27-20 Babingtonite Ca2(Fe,Mn)FeSi5O14(OH) P1 1

VIII/F.27-30 Manganbabingtonite Ca2(Mn,Fe)FeSi5O14(OH) P1 1

VIII/F.27-35 Scandiobabingtonite! Ca2(Fe,Mn)ScSi5O14(OH) P1 1

VIII/F.27-40 Santaclaraite CaMn4Si5O14(OH)2·(H2O) P1 1

VIII/F.27-50 Nambulite (Li,Na)Mn4[Si5O14(OH)] P1 1

VIII/F.27-60 Natronambulite (Na,Li)Mn4[Si5O14(OH)] P1 1

VIII/F.27-70 Lithiomarsturite LiCa2Mn2HSi5O15 P1 1

VIII/F.27-80 Marsturite NaCaMn3[Si5O14(OH)] P1,P 1 Tri

VIII/F.27-90 Inesite Ca2Mn7Si10O28(OH)2·5(H2O) P1 1

Other Santaclaraite Information

References:

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

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Santaclaraite

CaMn++4Si5O14(OH)2·(H2O)
Dana No: 65.4.2.1 Strunz No: VIII/F.27-40
Locality:

Notes: