Rhonite Mineral Data

Advertisment

McDougall Minerals sells high-quality mineral specimens from all over the world to collectors of all levels, from beginners to connoisseurs

Dakota Matrix was founded in 1996 and has offered systematic and rare mineral specimens online since 1998.

Weinrich Minerals, A Dealer in Fine Mineral Specimens - Since 1989. We buy collections and single high quality specimens.

General Rhonite Information

Chemical Formula:

Ca2(Mg,Fe++,Fe+++,Ti)6(Si,Al)6O20

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

Empirical Formula:

Ca_1.8Na_0.2K_0.1Mg_2.5Fe²⁺_1.3Fe³⁺_1.2TiSi_3.3Al_2.7O₂₀

Environment:

In silica-undersaturated, alkalic, mafic to intermediate igneous rocks, as a primary mineral or alteration of amphiboles.

IMA Status:

Valid Species (Pre-IMA) 1907

Locality:

Rhon Mountains, at Scharnhausen, near Stuttgart, Germany. Link to MinDat.org Location Data.

Name Origin:

Named for the locality.

Name Pronunciation:

Rhonite

Synonym:

Rhoenite

Rhonite Image

Images:

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

Axial Ratios:

a:b:c =0.9592:1:0.8395

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

Crystal System:

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

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

By Intensity(I/I_o): 2.947(1), 2.55(0.7), 2.691(0.65),

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

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

Cleavage:

{010} Good, {001} Good

Color:

Brown.

Density:

3.4 - 3.76, Average = 3.58

Diaphaneity:

Subtranslucent to Opaque

Habit:

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

Habit:

Skeletal - Crystals form crude outlines with missing faces.

Habit:

Tabular - Form dimensions are thin in one direction.

Hardness:

5-6 - Between Apatite and Orthoclase

Luster:

Sub Metallic

Optical Properties of Rhonite

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

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.

Pleochroism (x):

dark greenish brown or red brown.

Pleochroism (y):

dark reddish brown or dark greenish brown.

Pleochroism (z):

dark reddish brown or black.

Calculated Properties of Rhonite

Electron Density:

Bulk Density (Electron Density)=3.50 gm/cc
note: Specific Gravity of Rhonite =3.58 gm/cc.

Fermion Index:

Fermion Index = 0.02
Boson Index = 0.98

Photoelectric:

PE_Rhonite= 8.09 barns/electron
U=PE_Rhonite x r_electron= 28.32 barns/cc.

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

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

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

References:

NAME( AntBidBlaNic2) PHYS. PROP.(AntBidBlaNic2) OPTIC PROP.(AntBidBlaNic2)

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 - 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

Search for Rhonite using:

[AOL] [Bing] [Dog Pile] [GeoScienceWorld] [HotBot] [Ixquick] [Lycos] [MAMMA] [Scirus] [Teoma] [WebCrawler] [Wikipedia] [YAHOO]

Visit our Advertisers for Rhonite :

Adam's Minerals Google Search for Rhonite
Dakota Matrix Minerals Google Search for Rhonite
John Betts Fine Minerals Search for Rhonite
McDougall Minerals Google Search for Rhonite
Rock and Mineral Shows Google Search for Rhonite
Tucson Mall Google Search for Rhonite
Weinrich Minerals, Inc. Google Search for Rhonite

Ask about Rhonite here :
Ask-A-Mineralogist from the Mineralogical Society of America
Mindat.org's Discussion Groups
Original Rockhounds Discussion Group
Rockhounds Discussion Group on Yahoo Groups
Mineral Discussion Forum from Fabre Minerals - also available in Español

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

Rhonite

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

Notes: