Orlymanite Mineral Data

General Orlymanite Information

Chemical Formula:

Ca4Mn++3Si8O20(OH)6•2(H2O)

Composition:

Molecular Weight = 1,007.87 gm

Calcium 15.91 % Ca 22.26 % CaO

Manganese 16.35 % Mn 21.12 % MnO

Silicon 22.29 % Si 47.69 % SiO₂

Hydrogen 1.00 % H 8.94 % H₂O

Oxygen 44.45 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₄Mn²⁺₃Si₈O₂₀(OH)₆•2(H₂O)

Environment:

Part of a vein assemblage. One specimen known.

IMA Status:

Approved IMA 1990

Locality:

Wessels mine, Kalahari manganese field, Cape Province, South Africa. Link to MinDat.org Location Data.

Name Origin:

Named for Orlando P. Lyman (1903-1986), founder of Lyman House Memorial Museum, Hilo, Hawaii.

Name Pronunciation:

Orlymanite + Pronunciation

Synonym:

IMA1988-029

Orlymanite Image

Images:

Orlymanite

Comments: Brown crystalline orlymanite with radiating structure, on inesite.
Location: N'Chwaning Mine, Kuruman, Northern Cape Province, South Africa. Scale: See Photo.
© Jeff Weissman / Photographic Guide to Mineral Species

Orlymanite Crystallography

Axial Ratios:

a:c = 1:3.74166

Cell Dimensions:

a = 9.6, c = 35.92, Z = 5; V = 2,866.88 Den(Calc)= 2.92

Crystal System:

Trigonal Space Group: P 3-,P 3

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

By Intensity(I/I_o): 3.6(1), 1.84(0.9), 3.13(0.8),

Physical Properties of Orlymanite

Cleavage:

{0001} Perfect

Color:

Dark brown.

Density:

2.7 - 2.8, Average = 2.75

Diaphaneity:

Translucent

Habit:

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

Habit:

Rosette - Bundled tabular aggregates resembling rose flower petals.

Hardness:

4-5 - Fluorite-Apatite

Luster:

Vitreous (Glassy)

Streak:

light brown

Optical Properties of Orlymanite

Dichroism (e):

dark brown.

Dichroism (w):

pale brown.

Gladstone-Dale:

CI meas= 0.002 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.06 (Fair) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2048,KPDmeas= 0.2175,KC= 0.2179
Ncalc = 1.59 - 1.64

Optical Data:

Uniaxial (-), w=1.598.

Calculated Properties of Orlymanite

Electron Density:

Bulk Density (Electron Density)=2.73 gm/cc
note: Specific Gravity of Orlymanite =2.75 gm/cc.

Fermion Index:

Fermion Index = 0.01
Boson Index = 0.99

Photoelectric:

PE_Orlymanite= 6.91 barns/electron
U=PE_Orlymanite x rElectron Density= 18.89 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Orlymanite is Not Radioactive

Orlymanite Classification

Dana Class:

73.02.02b.02 (73)Phyllosilicate Condensed Tetrahedral Sheets

(73.02)with double and single layers

(73.02.02b)Reyerite group (Minehillite Subgroup)

73.02.02b.01 Minehillite (K,Na)2-3Ca28(Zn4Al4Si40)O112(OH)16 P 6₃/mmm, P 62c, or P 6₃mc Hex

73.02.02b.02 Orlymanite Ca4Mn3Si8O20(OH)6•2(H2O) P 3-,P 3 Trig

Strunz Class:

09.EJ.15 09 - SILICATES (Germanates)

09.E - Phyllosilicates

09.EJ -Unclassified phyllosilicates

09.EJ.15 Orlymanite Ca4Mn3Si8O20(OH)6•2(H2O) P 3-,P 3 Trig

Other Orlymanite Information

References:

NAME( Dana8) PHYS. PROP.(Dana8) OPTIC PROP.(Dana8)

See Also:

Links to other databases for Orlymanite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - GeoScienceWorld
6 - Google Images
7 - Google Scholar
8 - Handbook of Mineralogy (MinSocAm)
9 - Handbook of Mineralogy (UofA)
10 - MinDAT
11 - Mineralienatlas (Deutsch)
12 - Online Mineral Museum
13 - QUT Mineral Atlas
14 - Ruff.Info

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Print or Cut-and-Paste your Orlymanite Specimen Label here :

Orlymanite

Ca4Mn++3Si8O20(OH)6•2(H2O)
Dana No: 73.02.02b.02 Strunz No: 09.EJ.15
Locality:

Notes:

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