Rhonite Mineral Data

Rhonite Mineral Data
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General Rhonite Information

Help on Chemical Formula: Chemical Formula: Ca2(Mg,Fe++,Fe+++,Ti)6(Si,Al)6O20
Help on Composition: Composition: Molecular Weight = 814.43 gm
   Potassium   0.48 %  K     0.58 % K2O
   Sodium      0.56 %  Na    0.76 % Na2O
   Calcium     8.86 %  Ca   12.39 % CaO
   Magnesium   7.46 %  Mg   12.37 % MgO
   Titanium    5.88 %  Ti    9.81 % TiO2
   Aluminum    8.94 %  Al   16.90 % Al2O3
   Iron       17.14 %  Fe   11.47 % FeO / 11.76 % Fe2O3
   Silicon    11.38 %  Si   24.35 % SiO2
   Oxygen     39.29 %  O
             ______        ______ 
             100.00 %      100.39 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca1.8Na0.2K0.1Mg2.5Fe2+1.3Fe3+1.2TiSi3.3Al2.7O20
Help on Environment: Environment: In silica-undersaturated, alkalic, mafic to intermediate igneous rocks, as a primary mineral or alteration of amphiboles.
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1907
Help on Locality: Locality: Rhon Mountains, at Scharnhausen, near Stuttgart, Germany. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for the locality.
Help on Name Pronunciation: Name Pronunciation: Rhonite Say RHONITE
Help on Synonym: Synonym: Rhoenite
 

Rhonite Image

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Rhonite

Comments: Brown, striated, tabular crystal of rhonite on matrix.
Location: Sattleberg, Laacher See, Rhineland-Pal., Germany. Scale: Not Given.
© Lou Perloff / Photo Atlas of Minerals

Rhonite Crystallography
Help on Axial Ratios: Axial Ratios: a:b:c =0.9592:1:0.8395
Help on Cell Dimensions: Cell Dimensions: a = 10.478, b = 10.923, c = 9.17, Z = 2; alpha = 101.43°, beta = 96.95°, gamma = 129.68° V = 785.90 Den(Calc)= 3.44
Help on Crystal System: Crystal System: Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.947(1), 2.55(0.7), 2.691(0.65),
Click Here for Large Rhonite Structure Window Crystal Structure:

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Bonaccorsi E , Merlino S , Pasero M , European Journal of Mineralogy , 2 (1990) p.203-218, Rhonite: structural and microstructural features, crystal, chemistry and polysomatic relationships, Locality: volcanic breccias of Scharnhausen

View Additional jPOWD Structure files for Rhonite
[1]
 

Physical Properties of Rhonite

Help on Cleavage: Cleavage: {010} Good, {001} Good
Help on Color: Color: Brown.
Help on Density: Density: 3.4 - 3.76, Average = 3.58
Help on Diaphaneity: Diaphaneity: Subtranslucent to Opaque
Help on Habit: Habit: Prismatic - Crystals Shaped like Slender Prisms (e.g. tourmaline).
Help on Habit: Habit: Skeletal - Crystals form crude outlines with missing faces.
Help on Habit: Habit: Tabular - Form dimensions are thin in one direction.
Help on Hardness: Hardness: 5-6 - Between Apatite and Orthoclase
Help on Luster: Luster: Sub Metallic
 

Optical Properties of Rhonite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.032 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= 0.042 (Good) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2261,KPDmeas= 0.2286,KC= 0.2361
Ncalc = 1.8 - 1.89
Help on Optical Data: Optical Data: Biaxial (+), a=1.795-1.81, b=1.806-1.825, g=1.83-1.845, bire=0.0350, 2V(Calc)=70-84, 2V(Meas)=50-90. Dispersion r > v extreme.
Help on Pleochroism (x): Pleochroism (x): dark greenish brown or red brown.
Help on Pleochroism (y): Pleochroism (y): dark reddish brown or dark greenish brown.
Help on Pleochroism (z): Pleochroism (z): dark reddish brown or black.
 

Calculated Properties of Rhonite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Rhonite =3.58 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.02
Boson Index = 0.98
Help on Photoelectric: Photoelectric: PERhonite = 8.09 barns/electron
U=PERhonite x relectron= 28.32 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 6.76 (Gamma Ray American Petroleum Institute Units)
Concentration of Rhonite per GRapi unit = 14.80 (%)

Estimated Radioactivity from Rhonite - barely detectable

 

Rhonite Classification
Help on Dana Class: Dana Class: 69.02.01a.05 (69)Inosilicate Chains with Side Branches or Loops
  (69.02)with P>2
  (69.02.01a)Aenigmatite and related species (Aenigmatite subgroup)
 
69.02.01a.01 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1
 
69.02.01a.02 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
 
69.02.01a.03 Hogtuvaite (Ca,Na)2(Fe,Fe,Ti,Mg,Mn)6(Si,Be,Al)6O20 P1 1
 
69.02.01a.04 Krinovite NaMg2CrSi3O10 P1 1
 
69.02.01a.05 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
 
69.02.01a.06 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
 
69.02.01a.07 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1
 
69.02.01a.08 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1
 
69.02.01a.09 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1
Help on Strunz Class: Strunz Class: 09.DH.45 09 - SILICATES (Germanates)
  09.D - Inosilicates* Structural terminology according to Liebau (1985)
  09.DH -Inosilicates with 4-periodic single chains, Si4O12
 
09.DH.45 Aenigmatite (Na,Ca)4(Fe,Ti,Mg)12Si12O40 P1 1
 
09.DH.45 Dorrite Ca2Mg2Fe4(Al,Fe)4Si2O20 P1,P 1 Tri
 
09.DH.45 Krinovite NaMg2CrSi3O10 P1 1
 
09.DH.45 Rhonite Ca2(Mg,Fe,Fe,Ti)6(Si,Al)6O20 P1 1
 
09.DH.45 Sapphirine (Mg,Al)8(Al,Si)6O20 P1 1
 
09.DH.45 Serendibite Ca2(Mg,Al)6(Si,Al,B)6O20 P1 1
 
09.DH.45 Khmaralite! (Mg,Al,Fe)16(Al,Si,Be)12O40 P 21/c 2/m
 
09.DH.45 Makarochkinite! Ca2Fe4FeTiSi4BeAlO20 P1 1
 
09.DH.45 Welshite Ca4Mg9Sb3O4[Si6Be3AlFe2O36] P1 1
 
09.DH.45 Wilkinsonite Na2Fe4Fe2Si6O20 P1 1
 

Other Rhonite Information
Help on References: References: NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)
Help on See Also: See Also: Links to other databases for Rhonite :
1 - Am. Min. Crystal Structure Database
2 - Athena
3 - EUROmin Project
4 - Ecole des Mines de Paris
5 - Google Images
6 - Google Scholar
7 - Handbook of Mineralogy (MinSocAm)
8 - Handbook of Mineralogy (UofA)
9 - MinDAT
10 - MinMax(Deutsch)
11 - MinMax(English)
12 - Mineralienatlas (Deutsch)
13 - QUT Mineral Atlas
14 - Ruff.Info

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Rhonite

Ca2(Mg,Fe++,Fe+++,Ti)6(Si,Al)6O20
Dana No: 69.02.01a.05 Strunz No: 09.DH.45
Locality:

 

Notes: