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IMA2005-015a

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Formula:
[Mg
 
18
Al
 
9
(OH)
 
54
][Sr
 
2
(CO
 
3
,PO
 
4
)
 
9
(H
 
2
O,H
 
3
O)
 
11
]
System:TrigonalColour:Colourless to white
Hardness:2


Belongs to hydrotalcite-like layered double hydroxides.

Classification of IMA2005-015a

IMA status:Approved 2005
mindat.org URL:http://www.mindat.org/min-27438.html
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Type Occurrence of IMA2005-015a

Type Locality:Zheleznyi Mine (Iron Mine), Kovdor Massif, Kola Peninsula, Murmanskaja Oblast', Northern Region, Russia
General Appearance of Type Material:spherulites up to 1 mm in diameter, composed of thin bended ductile plates
Place of Conservation of Type Material:Mineralogical Museum, Department of Mineralogy, St. Petersburg State University, Russia
Geological Setting of type material:late-stage hydrothermal environment
Associated Minerals at type locality:
QuintiniteMagnetiteDolomiteClinochloreCarbonate-rich Fluorapatite

Physical Properties of IMA2005-015a

Lustre:Vitreous, Pearly
Colour:Colourless to white
Hardness (Mohs):2
Cleavage:Perfect
on {001}
Density (measured):2.21 g/cm3
Density (calculated):2.18 g/cm3

Crystallography of IMA2005-015a

Crystal System:Trigonal
Cell Parameters:a = 16.055Å, c = 25.66Å
Ratio:a:c = 1 : 1.598
Unit Cell Volume:V 5728 ų
Z:3
X-Ray Powder Diffraction:
d-spacingIntensity
8.52 (10)
6.41 (4)
5.13 (3)
4.27 (6)
3.665 (9)
3.547 (9)
3.081 (6)
Comments:Format: d/A, I, (hkl)

Optical Data of IMA2005-015a

Type:Uniaxial (-)
RI values: nω = 1.542 nε = 1.534
Maximum Birefringence:δ = 0.008

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Low
Pleochroism:Non-pleochroic

Chemical Properties of IMA2005-015a

Formula:
[Mg
 
18
Al
 
9
(OH)
 
54
][Sr
 
2
(CO
 
3
,PO
 
4
)
 
9
(H
 
2
O,H
 
3
O)
 
11
]
All elements listed in formula:Al, C, H, Mg, O, P, Sr
Analytical Data:Average values and standard deviations out of 10 electron microprobe analyses, water calculated by difference to 100 weight percent
Empirical formula based on 9 Al atoms
MgO (29.7 +/- 1.1) 
Al2O3 (18.3 +/- 0.7)
SrO (7.4 +/- 0.4)
CaO (0.2 +/- 0.1)
P2O5 (1.3 +/- 0.2)
CO2 (14.5 +/- 0.4)
H2O (28.6)
Empirical Formula:
Mg
 
18.00
Al
 
9.00
(OH)
 
54.00
(Sr
 
1.79
Mg
 
0.48
Ca
 
0.09
)
 
=2.36
(CO
 
3
)
 
8.26
(PO
 
4
)
 
0.46
(H
 
2
O)
 
6.54
(H
 
3
O)
 
4.18

Other Names for IMA2005-015a

Synonyms:
Karchevskyite
Other Languages:

Other Information

Fluorescence in UV light:none
IR Spectrum:wave numbers in 1/cm (s: shoulder):

3470, 3420 s, 3035, 2960s, 1650, 1426, 1366 (quintinite impurity), 1024, 937, 860, 779, 678, 615s, 553, 449, 386
Thermal Behaviour:Thermogravimetric Analysis (TGA):

- 12.2 wt.-% (230°C)
- 6.1 wt.-% (320°C)
- 23.7 wt.-% (440°C)

corresponding to a total weight loss of 42.0 wt.-%
Health Warning:No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

Internet Links for IMA2005-015a

Search Engines:
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
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    • Localities for IMA2005-015a

    The map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.
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    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Russia
     
    • Northern Region
      • Murmanskaja Oblast'
        • Kola Peninsula
          • Kovdor Massif
    		awaits confirmation
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