Yakhontovite Mineral Data (original) (raw)
General Yakhontovite Information
(Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2•3(H2O)
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
Ca0.2K0.01Cu0.8Fe3+0.8Mg0.7Si4O10(OH)2
As veins and coatings in deeply oxidized sulfide-cassiterite ores.
Approved IMA 1986
Komosomolsk region, "Far Eastern Region", Russia. Link to MinDat.org Location Data.
Named for Liiia KKonstantinovna Yakhontova I1926-), Russian mineralogist, University of Moscow, a specialist in cobalt deposits.
Yakhontovite Image
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
a:b:c =0.5775:1:1.5371
a = 5.26, b = 9.108, c = 14, Z = 2; beta = 90° V = 670.71 Den(Calc)= 2.12
Monoclinic - PrismaticH-M Symbol (2/m) Space Group: C 2/m
By Intensity(I/Io): 4.5(1), 7.3(1), 13.9(1),
Physical Properties of Yakhontovite
None
Pistachio green.
Transparent
Conchoidal - Fractures developed in brittle materials characterized by smoothly curving surfaces, (e.g. quartz).
Aggregates - Made of numerous individual crystals or clusters.
2-3 - Gypsum-Calcite
Earthy (Dull)
light green
Optical Properties of Yakhontovite
CI calc= -0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KC= 0.2287
Ncalc = 1.48
Biaxial (?), a=1.53-1.545, g=1.56-1.575, bire=0.0300
blue greens.
blue greens.
blue greens.
Calculated Properties of Yakhontovite
Bulk Density (Electron Density)=2.09 gm/cc
note: Specific Gravity of Yakhontovite =2.12 gm/cc.
Fermion Index = 0.01
Boson Index = 0.99
PEYakhontovite = 9.54 barns/electron
U=PEYakhontovite x relectron= 19.93 barns/cc.
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
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
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
NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.76,p668,1991) OPTIC PROP.(Am.Min.,Vol.76,p668,1991)
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: