Mineralogy Database

Rhodizite Mineral Data

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General Rhodizite Information

Help on Chemical  Formula: Chemical Formula: (K,Cs)Al4Be4(B,Be)12O28
Help on Composition: Composition: Molecular Weight = 778.83 gm
   Cesium      4.27 %  Cs    4.52 % Cs2O
   Potassium   3.77 %  K     4.54 % K2O
   Beryllium   8.10 %  Be   22.48 % BeO
   Aluminum   13.86 %  Al   26.18 % Al2O3
   Boron      12.49 %  B    40.22 % B2O3
   Oxygen     57.52 %  O
             ______        ______ 
             100.00 %       97.95 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: K0.75Cs0.25Al4Be412(B0.75)12(Be0.25)O28
Help on IMA Status: IMA Status: Valid Species (Pre-IMA) 1834
Help on Locality: Locality: Sarapulsk and Schaitansk, near Mursinsk, Ural Mountains, Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named from the Greek "rose-colored" because it tinges the blowpipe flame red.
Help on Name Pronunciation: Name Pronunciation: Rhodizite + Pronunciation Say RHODIZITE
Help on Synonym: Synonym: ICSD 17018
  PDF 18-327

Rhodizite Image

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Comments: Two large, blocky, greenish crystals of rhodizite on matrix.
Location: Antsogombato, Antsirabe, Madagascar. Scale: 2.6 x 2.5 cm.
© Fabre Minerals

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Comments: Several yellow, gemmy crystals of rhodizite frozen in a feldspar matrix.
Location: Sahanivotry, Sahatany Valley, Madagascar. Scale: 3 x 2.5 x 2 cm.
© Isaias Casanova / IC Minerals

Rhodizite Crystallography

Help on Cell Dimensions: Cell Dimensions: a = 7.317, Z = 1; V = 391.74 Den(Calc)= 3.30
Help on Crystal System: Crystal System: Isometric - Hextetrahedral H-M Symbol (4 3m) Space Group: P 43m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 2.983(1), 2.44(0.5), 3.27(0.5),

Physical Properties of Rhodizite

Help on Cleavage: Cleavage: {111} Indistinct, {111} Indistinct, {111} Indistinct
Help on Color: Color: Colorless, Grayish, Yellow, Yellowish white, White.
Help on Density: Density: 3.44
Help on Diaphaneity: Diaphaneity: Transparent to Translucent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Crystalline - Coarse - Occurs as well-formed coarse sized crystals.
Help on Hardness: Hardness: 8.5 - Chrysoberyl
Help on Luminescence: Luminescence: Piezoelectric and pyroelectric.
Help on Luster: Luster: Vitreous - Adamantine
Help on Streak: Streak: white

Optical Properties of Rhodizite

Help on Gladstone-Dale: Gladstone-Dale: CI meas= 0.035 (Excellent) - where the CI = (1-KPDmeas/KC)
CI calc= -0.006 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2102,KPDmeas= 0.2016,KC= 0.2089
Ncalc = 1.69 - 1.72
Help on Optical Data: Optical Data: Isotropic, n=1.6935.

Calculated Properties of Rhodizite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=3.19 gm/cc
note: Specific Gravity of Rhodizite =3.30 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.1
Boson Index = 0.9
Help on Photoelectric: Photoelectric: PERhodizite = 17.81 barns/electron
U=PERhodizite x relectron= 56.89 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 52.60 (Gamma Ray American Petroleum Institute Units)
Concentration of Rhodizite per GRapi unit = 1.90 (%)

Estimated Radioactivity from Rhodizite - barely detectable


Rhodizite Classification

Help on  Dana Class: Dana Class: (25)Anhydrous Borates Containing Hydroxyl or Halogen
  (25.08)Dana Type
  (25.08.02)Dana Group Rhodizite (K,Cs)Al4Be4(B,Be)12O28 P 43m 4 3m Londonite! CsAl4Be4(B,Be)12O28 P 43m 4 3m
Help on  Strunz Class: Strunz Class: 06.GC.05 06 - BORATES
  06.G - Heptaborates and other Megaborates
  06.GC -Tekto-dodecaborates
06.GC.05 Rhodizite (K,Cs)Al4Be4(B,Be)12O28 P 43m 4 3m
06.GC.05 Londonite! CsAl4Be4(B,Be)12O28 P 43m 4 3m

Other Rhodizite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Enc. of Minerals,2nd ed.,1990) OPTIC PROP.(Enc. of Minerals,2nd ed.,1990)
Help on See Also: See Also: Links to other databases for Rhodizite :
1 - Am. Min. Crystal Structure Database
2 - Amethyst Galleries' Mineral Gallery
3 - Athena
4 - EUROmin Project
5 - Ecole des Mines de Paris
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 - Tradeshop.com - The Rainbow of Gems

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Dana No: Strunz No: 06.GC.05





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