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Yakhontovite Mineral Data
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General Yakhontovite Information
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 Chemical Formula: |
(Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2•3(H2O) |
| Composition: |
Molecular Weight = 427.29 gm |
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Potassium 0.09 % K 0.11 % K2O |
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Calcium 1.88 % Ca 2.62 % CaO |
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Magnesium 3.98 % Mg 6.60 % MgO |
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Iron 10.46 % Fe 14.95 % Fe2O3 |
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Copper 11.90 % Cu 13.40 % Cu2O |
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Silicon 26.29 % Si 56.25 % SiO2 |
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Hydrogen 0.47 % H 4.22 % H2O |
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Oxygen 44.93 % O |
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______ ______ |
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100.00 % 98.15 % = TOTAL OXIDE |
| Empirical Formula: |
Ca0.2K0.01Cu0.8Fe3+0.8Mg0.7Si4O10(OH)2 |
| Environment: |
As veins and coatings in deeply oxidized sulfide-cassiterite ores. |
| IMA Status: |
Approved IMA 1986 |
| Locality: |
Komosomolsk region, "Far Eastern Region", Russia. Link to MinDat.org Location Data. |
| Name Origin: |
Named for Liiia KKonstantinovna Yakhontova I1926-), Russian mineralogist, University of Moscow, a specialist in cobalt deposits. |
| Name Pronunciation: |
Yakhontovite + Pronunciation  |
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Yakhontovite Image |
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Images:
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Yakhontovite
Comments: Green coating of yakhontovite in matrix.
Location: Granite Gap, Hidalgo Co., New Mexico, USA.
Scale: Specimen Size 2x2.5 cm.
© Diederik Visser |
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Yakhontovite Crystallography
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| Axial Ratios: |
a:b:c =0.5775:1:1.5371 |
| Cell Dimensions: |
a = 5.26, b = 9.108, c = 14, Z = 2; beta = 90° V = 670.71 Den(Calc)= 2.12 |
| Crystal System: |
Monoclinic - Prismatic H-M Symbol (2/m) Space Group: C 2/m |
| X Ray Diffraction: |
By Intensity(I/Io): 4.5(1), 7.3(1), 13.9(1), |
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Physical Properties of Yakhontovite
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| Cleavage: |
None |
| Color: |
Pistachio green. |
| Diaphaneity: |
Transparent |
| Fracture: |
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz). |
| Habit: |
Aggregates - Made of numerous individual crystals or clusters. |
| Hardness: |
2-3 - Gypsum-Calcite |
| Luster: |
Earthy (Dull) |
| Streak: |
light green |
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Optical Properties of Yakhontovite
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| Gladstone-Dale: |
CI calc= -0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KC= 0.2287
Ncalc = 1.48 |
| Optical Data: |
Biaxial (?), a=1.53-1.545, g=1.56-1.575, bire=0.0300 |
| Pleochroism (x): |
blue greens. |
| Pleochroism (y): |
blue greens. |
| Pleochroism (z): |
blue greens. |
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Calculated Properties of Yakhontovite
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| Electron Density: |
Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Yakhontovite =2.12 gm/cc.
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| Fermion Index: |
Fermion Index = 0.01
Boson Index = 0.99 |
| Photoelectric: |
PEYakhontovite = 9.54 barns/electron
U=PEYakhontovite x relectron= 19.93 barns/cc.
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| Radioactivity: |
GRapi = 1.31 (Gamma Ray American Petroleum Institute Units)
Concentration of Yakhontovite per GRapi unit = 76.09 (%)
Estimated Radioactivity from Yakhontovite  - barely detectable
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Yakhontovite Classification
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| Dana Class: |
71.03.01b.07 (71)Phyllosilicate Sheets of Six-Membered Rings |
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(71.03)with 2:1 clays |
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(71.03.01b)Smectite group (Trioctahedral Smectites) |
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71.03.01b.01 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2•1-5(H2O) Unk. Mono |
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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 |
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71.03.01b.02a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2•4(H2O) C? Mono |
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71.03.01b.03 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m |
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71.03.01b.04 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m |
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71.03.01b.05 Pimelite? Ni3Si4O10(OH)2•4(H2O) Unk. Hex |
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71.03.01b.06 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2•n(H2O) Unk (ORTH ?) Mono |
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71.03.01b.07 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m |
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71.03.01b.08 Zincsilite Zn3Si4O10(OH)2•4(H2O)(?) C 2/m ? 2/m |
| Strunz Class: |
09.EC.40 09 - SILICATES (Germanates) |
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09.E - Phyllosilicates |
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09.EC -Phyllosilicates with mica sheets, composed of tetrahedral and octahedral nets |
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09.EC.40 Almbosite? Fe5Fe4V4Si3O27 Ortho ? Ortho |
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09.EC.40 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2•n(H2O) C 2/m or ORTH 2/m |
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09.EC.40 Kurumsakite (Zn,Ni,Cu)8Al8V2Si5O35•27(H2O)(?) Unk Ortho |
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09.EC.40 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2•n(H2O) C 2/m 2/m |
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09.EC.40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2•n(H2O) C 2/m 2/m |
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09.EC.40 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2•4(H2O) C 2/m 2/m |
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09.EC.40 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2•3(H2O) C 2/m 2/m |
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Other Yakhontovite Information
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| References: |
NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.76,p668,1991) OPTIC PROP.(Am.Min.,Vol.76,p668,1991) |
| 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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Yakhontovite
(Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2•3(H2O)
Dana No: 71.03.01b.07 Strunz No: 09.EC.40
Locality:
Notes:
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