Synadelphite Mineral Data

General Synadelphite Information

Chemical Formula:

(Mn,Mg,Ca,Pb)9(As+++O3)(As+++++O4)2(OH)9•2(H2O) (?)

Composition:

Molecular Weight = 1,089.48 gm

Calcium 0.37 % Ca 0.51 % CaO

Magnesium 0.22 % Mg 0.37 % MgO

Manganese 43.37 % Mn 56.00 % MnO

Arsenic 20.63 % As 9.08 % As₂O₃ / 21.10 % As₂O₅

Hydrogen 1.20 % H 10.75 % H₂O

Lead 1.90 % Pb 2.05 % PbO

Oxygen 32.31 % O

______ ______

100.00 % 99.85 % = TOTAL OXIDE

Empirical Formula:

Mn²⁺_8.6Mg_0.1Ca_0.1Pb_0.1(AsO₃)(AsO₄)₂(OH)₉·2(H₂O)

Environment:

Low-temperature hydrothermal mineral cutting hausmannite ores in dolomitic marble.

IMA Status:

Valid Species (Pre-IMA) 1884

Locality:

Moss mine, Nordmark and at Langban, Varmland, Sweden. Link to MinDat.org Location Data.

Name Origin:

From the Greek for "with" and "brother," as it is commonly associated with several other chemically similar minerals.

Name Pronunciation:

Synadelphite + Pronunciation

Synonym:

ICSD 15184

PDF 24-725

Synadelphite Image

Images:

Synadelphite

Comments: Moss mine, Nordmark, VÃ¤rmland, Sweden.
Location: Black psuedo-octahedral crystals of synadelphite with cube modifications. Scale: See Image.
© Rruff Database

Synadelphite Crystallography

Axial Ratios:

a:b:c =0.57:1:0.5239

Cell Dimensions:

a = 10.754, b = 18.865, c = 9.884, Z = 4; V = 2,005.21 Den(Calc)= 3.61

Crystal System:

Orthorhombic - DipyramidalH-M Symbol (2/m 2/m 2/m) Space Group: P nma

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

By Intensity(I/I_o): 8.72(1), 2.64(0.9), 9.36(0.7),

Forms:

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Forms: ( 0 1 0) ( 1 2 1) ( 0 1 1) ( 1 1 0)

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Crystal Structure:

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Moore P B , American Mineralogist , 55 (1970) p.2023-2037, Crystal chemistry of the basic manganese arsenates: IV. Mixed arsenic valences, in the crystal structure of synadelphite

Physical Properties of Synadelphite

Cleavage:

{010} Indistinct

Color:

Colorless, Red, Reddish brown, Dark brown, Black.

Density:

3.57 - 3.79, Average = 3.68

Diaphaneity:

Transparent to Opaque

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).

Habit:

Reniform - "Kidney like" in shape (e.g.. hematite).

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

4.5 - Between Fluorite and Apatite

Luster:

Vitreous - Adamantine

Optical Properties of Synadelphite

Gladstone-Dale:

CI meas= -0.082 (Poor) - where the CI = (1-KPDmeas/KC)
CI calc= -0.103 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2282,KPDmeas= 0.2238,KC= 0.2069
Ncalc = 1.74 - 1.78

Optical Data:

Biaxial (+), a=1.75-1.87, b=1.751-1.88, g=1.761-1.93, bire=0.0110-0.0600, 2V(Calc)=36-50, 2V(Meas)=37-40. Dispersion r > v.

Pleochroism (x):

colorless or light brown.

Pleochroism (y):

colorless or brown.

Pleochroism (z):

light brown or dark red brown.

Calculated Properties of Synadelphite

Electron Density:

Bulk Density (Electron Density)=3.48 gm/cc
note: Specific Gravity of Synadelphite =3.68 gm/cc.

Fermion Index:

Fermion Index = 0.0045879668
Boson Index = 0.9954120332

Photoelectric:

PE_Synadelphite= 56.47 barns/electron
U=PE_Synadelphite x rElectron Density= 196.25 barns/cc.

Radioactivity:

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

Synadelphite Classification

Dana Class:

43.05.12.01 (43)Compound Phosphates, etc.

(43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)

(43.05.12)Synadelphite Group

43.05.12.01 Synadelphite (Mn,Mg,Ca,Pb)9(AsO3)(AsO4)2(OH)9•2(H2O)(?) P nma 2/m 2/m 2/m

43.05.12.02 Birchite! Cd2Cu2(PO4)2(SO4)•5H2O P nma 2/m 2/m 2/m

Strunz Class:

08.BE.50 08 - PHOSPHATES, ARSENATES, VANADATES

08.B - Phosphates, etc. with Additional Anions, without H2O

08.BE -With only medium-sized cations, (OH, etc.):RO4 > 2:1

08.BE.50 Synadelphite (Mn,Mg,Ca,Pb)9(AsO3)(AsO4)2(OH)9•2(H2O)(?) P nma 2/m 2/m 2/m

Other Synadelphite Information

References:

NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)

See Also:

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

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Ask about Synadelphite here :
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Print or Cut-and-Paste your Synadelphite Specimen Label here :

Synadelphite

(Mn,Mg,Ca,Pb)9(As+++O3)(As+++++O4)2(OH)9•2(H2O) (?)
Dana No: 43.05.12.01 Strunz No: 08.BE.50
Locality:

Notes: