Mineralogy Database

Synadelphite Mineral Data

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General Synadelphite Information

Help on Chemical  Formula: Chemical Formula: (Mn,Mg,Ca,Pb)9(As+++O3)(As+++++O4)2(OH)9•2(H2O) (?)
Help on Composition: 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
Help on Empirical Formula: Empirical Formula: Mn2+8.6Mg0.1Ca0.1Pb0.1(AsO3)(AsO4)2(OH)9�2(H2O)
Help on Environment: Environment: Low-temperature hydrothermal mineral cutting hausmannite ores in dolomitic marble.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1884
Help on Locality: Locality: Moss mine, Nordmark and at Langban, Varmland, Sweden. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: From the Greek for "with" and "brother," as it is commonly associated with several other chemically similar minerals.
Help on Name Pronunciation: Name Pronunciation: Synadelphite + Pronunciation Say SYNADELPHITE
Help on Synonym: Synonym: ICSD 15184
  PDF 24-725

Synadelphite Image

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

Synadelphite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.57:1:0.5239
Help on Cell Dimensions: Cell Dimensions: a = 10.754, b = 18.865, c = 9.884, Z = 4; V = 2,005.21 Den(Calc)= 3.61
Help on Crystal System: Crystal System: Orthorhombic - Dipyramidal H-M Symbol (2/m 2/m 2/m) Space Group: P nma
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 8.72(1), 2.64(0.9), 9.36(0.7),
Help on Forms: Forms:

Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize

S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu

Help on Above

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

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Physical Properties of Synadelphite

Help on Cleavage: Cleavage: {010} Indistinct
Help on Color: Color: Colorless, Red, Reddish brown, Dark brown, Black.
Help on Density: Density: 3.57 - 3.79, Average = 3.68
Help on Diaphaneity: Diaphaneity: Transparent to Opaque
Help on Fracture: Fracture: Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Reniform - "Kidney like" in shape (e.g.. hematite).
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 4.5 - Between Fluorite and Apatite
Help on Luster: Luster: Vitreous - Adamantine

Optical Properties of Synadelphite

Help on Gladstone-Dale: 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
Help on Optical Data: 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.
Help on Pleochroism (x): Pleochroism (x): colorless or light brown.
Help on Pleochroism (y): Pleochroism (y): colorless or brown.
Help on Pleochroism (z): Pleochroism (z): light brown or dark red brown.

Calculated Properties of Synadelphite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.48 gm/cc
note: Specific Gravity of Synadelphite =3.68 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.0045879668
Boson Index = 0.9954120332
Help on Photoelectric: Photoelectric: PESynadelphite = 56.47 barns/electron
U=PESynadelphite x rElectron Density= 196.25 barns/cc.
Help on Radioactivity: Radioactivity: GRapi = 0 (Gamma Ray American Petroleum Institute Units)
Synadelphite is Not Radioactive

Synadelphite Classification

Help on  Dana Class: Dana Class: (43)Compound Phosphates, etc.
  (43.05)(Hydrated Compound Anions With Hydroxyl or Halogen)
  (43.05.12)Synadelphite Group Synadelphite (Mn,Mg,Ca,Pb)9(AsO3)(AsO4)2(OH)9•2(H2O)(?) P nma 2/m 2/m 2/m Birchite! Cd2Cu2(PO4)2(SO4)•5H2O P nma 2/m 2/m 2/m
Help on  Strunz Class: 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

Help on References: References: NAME( AntBidBlaNic4) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(AntBidBlaNic4)
Help on See Also: 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

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


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





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