Ferroaxinite Mineral Data

Ferroaxinite Mineral Data +

[Register] [Auction Rules] [Current Listing] [About Us] [Site Map]
e-Rocks.com, auction and sales venue for all rock and mineral enthusiasts
Our mission is to provide an online centre for Buyers and Sellers with reliable service and support
Brought to you by Thames Valley Minerals

General Ferroaxinite Information

Chemical Formula:

Ca2Fe++Al2BO3Si4O12(OH)

Composition:

Molecular Weight = 570.12 gm

Calcium 14.06 % Ca 19.67 % CaO

Aluminum 9.47 % Al 17.88 % Al₂O₃

Iron 9.80 % Fe 12.60 % FeO

Silicon 19.71 % Si 42.16 % SiO₂

Boron 1.90 % B 6.11 % B₂O₃

Hydrogen 0.18 % H 1.58 % H₂O

Oxygen 44.90 % O

______ ______

100.00 % 100.00 % = TOTAL OXIDE

Empirical Formula:

Ca₂Fe²⁺Al₂(BO₃)Si₄O₁₂(OH)

Environment:

Contact metamorphic, hydrothermal, and alpine vein rocks.

IMA Status:

Valid Species (Pre-IMA) 1909

Locality:

Boug d'Oisans, France. Link to MinDat.org Location Data.

Name Origin:

From the Greek acine - "ax" in allusion to the acute shape of typical crystals and the Latin - ferrum - "iron" in reference to the Fe in the chemical formula.

Synonym:

Axinite

ICSD 4343

PDF 27-76

Ferroaxinite Image

Images:

Ferroaxinite

Comments: Doubly terminated ferroaxinite crystal with good luster and form.
Location: Puyva, Polar Ural, Russia. Scale: 3x5x2 cm.
© Fabre Minerals

Ferroaxinite Crystallography

Axial Ratios:

a:b:c =0.9716:1:0.777

Cell Dimensions:

a = 8.957, b = 9.218, c = 7.163, Z = 2; alpha = 102.7°, beta = 98.03°, gamma = 88.03° V = 570.95 Den(Calc)= 3.32

Crystal System:

Triclinic - PinacoidalH-M Symbol ( 1) Space Group: P1

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

By Intensity(I/I_o): 2.812(1), 3.16(0.9), 3.46(0.8),

Forms:

Mouse
Dbl Clk - Start-Stop Rotation
RMB - Cycle Display Modes
Drag1 - Manipulate Crystal
Drag2 - Resize
Keyboard
S - Stereo
I - Indicies
<space> - Start-Stop Rotation
F - Fit to Screen
M - Menu
Help on Above

Forms: [ 1 1 1] [ 1 1 1] [ 1 0 0] [ 1 1 0] [ 2 0 1] [ 1 1 0]

Warning: this large pop-up is very compute intensive and may not work well with some computers.

Crystal Structure:

Mouse
drag1 - LMB Manipulate Structure
drag2 - RMB Resize/Rotate
Keyboard
S - Stereo Pair on/off
H - Help Screen
I - Data Info
A - Atoms On/Off
P - Polyhedra On/Off
B - Bonds On/Off
Help on Above

Swinnea J S , Steinfink H , Rendon-DiazMiron L E , Enciso de la Vega S , American Mineralogist , 66 (1981) p.428-431, The crystal structure of a Mexican axinite

Physical Properties of Ferroaxinite

Cleavage:

[100] Distinct, [001] Poor, [110] Poor

Color:

Brown, Purplish blue, Gray, Greenish yellow.

Density:

3.27 - 3.29, Average = 3.28

Diaphaniety:

Transparent to subtranslucent

Fracture:

Brittle - Conchoidal - Very brittle fracture producing small, conchoidal fragments.

Habit:

Lamellar - Thin laminae producing a lamellar structure.

Habit:

Massive - Granular - Common texture observed in granite and other igneous rock.

Hardness:

6.5-7 - Pyrite-Quartz

Luminescence:

Non-fluorescent.

Luster:

Vitreous (Glassy)

Streak:

white

Optical Properties of Ferroaxinite

Gladstone-Dale:

CI meas= -0.007 (Superior) - where the CI = (1-KPDmeas/KC)
CI calc= 0.005 (Superior) - where the CI = (1-KPDcalc/KC)
KPDcalc= 0.2072,KPDmeas= 0.2098,KC= 0.2082

Optical Data:

Biaxial (-), a=1.672-1.693, b=1.677-1.701, g=1.681-1.704, bire=0.0090-0.0110, 2V(Calc)=62-82, 2V(Meas)=69-87. Dispersion strong, r < v.

Pleochroism (x):

colorless, yellow, light brown, yellow brown, or pale green.

Pleochroism (y):

colorless, deep yellow, deep blue, pale violet, or violet.

Pleochroism (z):

colorless, pale green, olive yellow, brown, or dark violet.

Calculated Properties of Ferroaxinite

Electron Density:

r_electron=3.28 gm/cc
note: r_Ferroaxinite=3.32 gm/cc.

Fermion Index

Fermion Index = 0.01545
Boson Index = 0.98455

Photoelectric:

PE_Ferroaxinite= 5.68 barns/electron
U=PE_Ferroaxinite x r_electron= 18.64 barns/cc.

Radioactivity:

GRapi = 0 (Gamma Ray American Petroleum Institute Units)

Ferroaxinite is Not Radioactive

Ferroaxinite Classification

Dana Class:

56.2.2.1 (56)Sorosilicate Si2O7 Groups and O, OH, F. and H2O

(56.2)with cations in [4] and/or >[4] coordination

(56.2.2)Axinite group

56.2.2.1 Ferroaxinite Ca2FeAl2BO3Si4O12(OH) P1 1

56.2.2.2 Magnesio-axinite Ca2MgAl2BO3Si4O12(OH) P1 1

56.2.2.3 Manganaxinite Ca2MnAl2BO3Si4O12(OH) P1 1

56.2.2.4 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

Strunz Class:

VIII/E.06-20 VIII - Silicates

VIII/E - Cyklosilicates, quadruplet rings [Si4O11]8-

VIII/E.06 - Axinite group, Magnesio-axinite - Ashburtonite series

VIII/E.06-10 Magnesio-axinite Ca2MgAl2BO3Si4O12(OH) P1 1

VIII/E.06-20 Ferroaxinite Ca2FeAl2BO3Si4O12(OH) P1 1

VIII/E.06-30 Manganaxinite Ca2MnAl2BO3Si4O12(OH) P1 1

VIII/E.06-40 Tinzenite (Ca,Mn,Fe)3Al2BO3Si4O12(OH) P1 1

VIII/E.06-50 Papagoite CaCuAlSi2O6(OH)3 C 2/m 2/m

VIII/E.06-60 Ashburtonite HPb4Cu4Si4O12(HCO3)4(OH)4Cl I 4/m 4/m

Other Ferroaxinite Information

References:

NAME( Duda&Rejl90) PHYS. PROP.(Larousse des Mineraux,1981) OPTIC PROP.(Heinrich65)

Search for Ferroaxinite using:

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

Visit our Advertisers for Ferroaxinite :
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 Ferroaxinite Mineral Data :

Ask about Ferroaxinite 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 Ferroaxinite Specimen Label here :

Ferroaxinite

Ca2Fe++Al2BO3Si4O12(OH)
Dana No: 56.2.2.1 Strunz No: VIII/E.06-20
Locality:

Notes: