Mineralogy Database

Yakhontovite Mineral Data

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General Yakhontovite Information

Help on Chemical  Formula: Chemical Formula: (Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2•3(H2O)
Help on Composition: Composition: Molecular Weight = 427.29 gm
   Potassium   0.09 %  K     0.11 % K2O
   Calcium     1.88 %  Ca    2.62 % CaO
   Magnesium   3.98 %  Mg    6.60 % MgO
   Iron       10.46 %  Fe   14.95 % Fe2O3
   Copper     11.90 %  Cu   13.40 % Cu2O
   Silicon    26.29 %  Si   56.25 % SiO2
   Hydrogen    0.47 %  H     4.22 % H2O
   Oxygen     44.93 %  O
             ______        ______ 
             100.00 %       98.15 % = TOTAL OXIDE
Help on Empirical Formula: Empirical Formula: Ca0.2K0.01Cu0.8Fe3+0.8Mg0.7Si4O10(OH)2
Help on Environment: Environment: As veins and coatings in deeply oxidized sulfide-cassiterite ores.
Help on IMA Status: IMA Status: Approved IMA 1986
Help on Locality: Locality: Komosomolsk region, "Far Eastern Region", Russia. Link to MinDat.org Location Data.
Help on Name Origin: Name Origin: Named for Liiia KKonstantinovna Yakhontova I1926-), Russian mineralogist, University of Moscow, a specialist in cobalt deposits.
Help on Name Pronunciation: Name Pronunciation: Yakhontovite + Pronunciation Say YAKHONTOVITE

Yakhontovite Image

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Comments: Green coating of yakhontovite in matrix.
Location: Granite Gap, Hidalgo Co., New Mexico, USA. Scale: Specimen Size 2x2.5 cm.
© Diederik Visser

Yakhontovite Crystallography

Help on Axial Ratios: Axial Ratios: a:b:c =0.5775:1:1.5371
Help on Cell Dimensions: Cell Dimensions: a = 5.26, b = 9.108, c = 14, Z = 2; beta = 90° V = 670.71 Den(Calc)= 2.12
Help on Crystal System: Crystal System: Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m
Help on X Ray Diffraction: X Ray Diffraction: By Intensity(I/Io): 4.5(1), 7.3(1), 13.9(1),

Physical Properties of Yakhontovite

Help on Cleavage: Cleavage: None
Help on Color: Color: Pistachio green.
Help on Diaphaneity: Diaphaneity: Transparent
Help on Fracture: Fracture: Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Help on Habit: Habit: Aggregates - Made of numerous individual crystals or clusters.
Help on Hardness: Hardness: 2-3 - Gypsum-Calcite
Help on Luster: Luster: Earthy (Dull)
Help on Streak: Streak: light green

Optical Properties of Yakhontovite

Help on Gladstone-Dale: Gladstone-Dale: CI calc= -0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KC= 0.2287
Ncalc = 1.48
Help on Optical Data: Optical Data: Biaxial (?), a=1.53-1.545, g=1.56-1.575, bire=0.0300
Help on Pleochroism (x): Pleochroism (x): blue greens.
Help on Pleochroism (y): Pleochroism (y): blue greens.
Help on Pleochroism (z): Pleochroism (z): blue greens.

Calculated Properties of Yakhontovite

Help on Electron Density: Electron Density: Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Yakhontovite =2.12 gm/cc.
Help on Fermion Index: Fermion Index: Fermion Index = 0.01
Boson Index = 0.99
Help on Photoelectric: Photoelectric: PEYakhontovite = 9.54 barns/electron
U=PEYakhontovite x relectron= 19.93 barns/cc.
Help on Radioactivity: Radioactivity:

GRapi = 1.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Yakhontovite per GRapi unit = 76.09 (%)

Estimated Radioactivity from Yakhontovite - barely detectable


Yakhontovite Classification

Help on  Dana Class: Dana Class: 71.03.01b.07 (71)Phyllosilicate Sheets of Six-Membered Rings
  (71.03)with 2:1 clays
  (71.03.01b)Smectite group (Trioctahedral Smectites)
71.03.01b.01 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono
71.03.01b.02 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01b.02a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono
71.03.01b.03 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
71.03.01b.04 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m
71.03.01b.05 Pimelite? Ni3Si4O10(OH)2•4(H2O) Unk. Hex
71.03.01b.06 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono
71.03.01b.07 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m
71.03.01b.08 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m
Help on  Strunz Class: Strunz Class: 09.EC.40 09 - SILICATES (Germanates)
  09.E - Phyllosilicates
  09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets
09.EC.40 Almbosite? Fe5Fe4V4Si3O27 Ortho ? Ortho
09.EC.40 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m
09.EC.40 Kurumsakite (Zn,Ni,Cu)8Al8V2Si5O35•27(H2O)(?) Unk Ortho
09.EC.40 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m
09.EC.40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m
09.EC.40 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m
09.EC.40 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m

Other Yakhontovite Information

Help on References: References: NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.76,p668,1991) OPTIC PROP.(Am.Min.,Vol.76,p668,1991)
Help on See Also: See Also: Links to other databases for Yakhontovite :
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

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Dana No: 71.03.01b.07 Strunz No: 09.EC.40





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