Yakhontovite Mineral Data

Yakhontovite Mineral Data +

[Newest Minerals] [Equipment] [Analytical Services] [About Us] [Mineral Gallery] [eBay Store]
See Also: [Diamond Crystals] [Mineral News] [Hudson Institute] [Minerals on CDROM]
Rare Minerals, Meteorites, Equipment and Analytical Services
Excalibur Mineral Company, World leaders in the supply of rare species
Serving the scientific and collector communities since 1974

General Yakhontovite Information

Chemical Formula:

(Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2·3(H2O)

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

Empirical Formula:

Ca_0.2K_0.01Cu_0.8Fe³⁺_0.8Mg_0.7Si₄O₁₀(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.

Search for Yakhontovite Images

Images:

Image not yet available on Webmineral.com

Try searching images.google.com or Mindat Picture Gallary for mineral pictures. Caution: The images retrieved may not be appropriate.

Yakhontovite Crystallography

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 - PrismaticH-M Symbol (2/m) Space Group: C 2/m

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

By Intensity(I/I_o): 4.5(1), 7.3(1), 13.9(1),

Physical Properties of Yakhontovite

Cleavage:

None

Color:

Pistachio green.

Diaphaniety:

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

Optical Properties of Yakhontovite

Gladstone-Dale:

CI calc= -0.14 (Poor) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2606,KC= 0.2287

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.

Calculated Properties of Yakhontovite

Electron Density:

r_electron=2.09 gm/cc
note: r_Yakhontovite=2.12 gm/cc.

Fermion Index

Fermion Index = 0.01871
Boson Index = 0.98129

Photoelectric:

PE_Yakhontovite= 9.54 barns/electron
U=PE_Yakhontovite x r_electron= 19.93 barns/cc.

Radioactivity:

GRapi = 1.31 (Gamma Ray American Petroleum Institute Units)

Estimated Radioactivity from Yakhontovite - barely detectable

Yakhontovite Classification

Dana Class:

71.3.1b.7 (71)Phyllosilicate Sheets of Six-Membered Rings

(71.3)with 2:1 clays

(71.3.1b)Smectite group (Trioctahedral Smectites)

71.3.1b.1 Sobotkite? (K,Ca0.5)0.33(Mg,Al)3(Si3Al)O10(OH)2·1-5(H2O) Unk. Mono

71.3.1b.2 Saponite (Ca/2,Na)0,3(Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1b.2a Ferrosaponite! Ca0.3(Fe,Mg,Fe)3(Si,Al)4O10(OH)2·4(H2O) C? Mono

71.3.1b.3 Sauconite Na0,3Zn3(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

71.3.1b.4 Hectorite Na0,3(Mg,Li)3Si4O10(OH)2 C 2/m 2/m

71.3.1b.5 Pimelite Ni3Si4O10(OH)2·4(H2O) Unk. Hex

71.3.1b.6 Stevensite (Ca0.5,Na)0.33(Mg,Fe)3Si4O10(OH)2·n(H2O) Unk (ORTH ?) Mono

71.3.1b.7 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2·3(H2O) C 2/m 2/m

71.3.1b.8 Zincsilite Zn3Si4O10(OH)2·4(H2O)(?) C 2/m ? 2/m

Strunz Class:

VIII/H.19-70 VIII - Silicates

VIII/H - Phyllosilicates (layered) Mica like with [Si4O10]4- and related groups

VIII/H.19 - Brammallite ? - Yakhontovite series

VIII/H.19-10 Brammallite* (Na,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/c 2/m

VIII/H.19-10a Brinrobertsite! (Na,K,Ca)x(Al,Fe,Mg)4(Si,Al)8O20(OH)4·3.54(H2O)[x=0.35,n=3.54] pseudo 2/m 2/m

VIII/H.19-15 Illite* (K,H3O)(Al,Mg,Fe)2(Si,Al)4O10[(OH)2,(H2O)] C 2/m 2/m

VIII/H.19-20 Montmorillonite (Na,Ca)0,3(Al,Mg)2Si4O10(OH)2·n(H2O) C 2/m 2/m

VIII/H.19-30 Beidellite Na0.5Al2(Si3.5Al0.5)O10(OH)2·n(H2O) C 2/m or ORTH 2/m

VIII/H.19-40 Nontronite Na0.3Fe2(Si,Al)4O10(OH)2·n(H2O) C 2/m 2/m

VIII/H.19-50 Volkonskoite Ca0.3(Cr,Mg,Fe)2(Si,Al)4O10(OH)2·4(H2O) C 2/m 2/m

VIII/H.19-60 Swinefordite (Li,Ca0.5,Na)0.72(Li,Al,Mg)2.66(Si,Al)4O10(OH,F)2·2(H2O) C 2/m (MON or ORTH) 2/m

VIII/H.19-70 Yakhontovite (Ca,K)0.5(Cu,Fe,Mg)2Si4O10(OH)2·3(H2O) C 2/m 2/m

Other Yakhontovite Information

References:

NAME( Dana8) PHYS. PROP.(Am.Min.,Vol.76,p668,1991) OPTIC PROP.(Am.Min.,Vol.76,p668,1991)

Search for Yakhontovite using:

[ALTAVISTA] [AOL] [About.com] [All-The-Web] [HotBot] [Ixquick] [LookSmart] [MAMMA] [MSN.COM] [Netscape] [Teoma] [Wikipedia] [YAHOO]

Visit our Advertisers for Yakhontovite :
AA Mineral Specimens
B and L Minerals
Dan Weinrich Fine Minerals
Dan Weinrich Auctions
e-Rocks Auctions
Excalibur Minerals
Exceptional Minerals
Fabre Minerals
Greenside Minerals
John Betts Fine Minerals
Masons Minerals
Minernet.it
Mineral News
Mineral of the Month Club
MineralsWeb Fine Minerals
Rockshop.cz Kalat Fine Minerals
T G Fine Minerals
Wrights Rock Shop

Translate Yakhontovite Mineral Data :

Ask about Yakhontovite 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 Yakhontovite Specimen Label here :

Yakhontovite

(Ca,K)0.5(Cu,Fe+++,Mg)2Si4O10(OH)2·3(H2O)
Dana No: 71.3.1b.7 Strunz No: VIII/H.19-70
Locality:

Notes: