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Falsterite

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About FalsteriteHide

Formula:
Ca2MgMn2+2Fe2+2Fe3+2Zn4(PO4)8(OH)4(H2O)14
Colour:
Greenish blue
Lustre:
Vitreous
Hardness:
2
Specific Gravity:
2.78
Crystal System:
Monoclinic
Name:
Named in 2012 by Anthony Robert Kampf, Stuart J. Mills, William B. Simmons, James W. Nizamoff, and Robert W. Whitmore in honor of Alexander U. Falster [b. February 19, 1952 Wisconsin, USA], analytical technologist and specialist in granite pegmatites at the University of New Orleans, Louisiana.
Closely related to ferraioloite. Unique combination of elements.


Classification of FalsteriteHide

Approved
Approval Year:
2011

Physical Properties of FalsteriteHide

Vitreous
Transparency:
Transparent
Colour:
Greenish blue
Streak:
Very pale greenish blue
Hardness:
Tenacity:
Flexible
Cleavage:
Perfect
on {010}
Fracture:
Irregular/Uneven
Density:
2.78(3) g/cm3 (Measured)    2.837 g/cm3 (Calculated)

Optical Data of FalsteriteHide

Type:
Biaxial (-)
RI values:
nα = 1.575(10) nβ = 1.600(5) nγ = 1.610(5)
2V:
Measured: 60° (10), Calculated: 63.8°
Max Birefringence:
δ = 0.035
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, strong
Pleochroism:
Visible
Comments:
X, Z = colourless to very pale yellow, Y = blue-green; Y >> X ≈ Z.

Chemical Properties of FalsteriteHide

Formula:
Ca2MgMn2+2Fe2+2Fe3+2Zn4(PO4)8(OH)4(H2O)14

Crystallography of FalsteriteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 6.3868(18) Å, b = 21.260(7) Å, c = 15.365(5) Å
β = 90.564(6)°
Ratio:
a:b:c = 0.3 : 1 : 0.723
Unit Cell V:
2086.2 ų
Z:
2
Morphology:
Very thin plates and rectangular laths up to 0.7 mm in length. Laths are flattened on {010} and elongate along [100]; they exhibit the forms {010}, {100}, and {001}.
Twinning:
Lamellar twinning is common.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
12.865(34)
10.675(100)
4.834(12)
4.043(18)
3.220(25)
3.107(14)
2.846(19)
1.596(14)

Type Occurrence of FalsteriteHide

General Appearance of Type Material:
Very thin greenish-blue plates and rectangular laths up to 0.7 mm in length.
Place of Conservation of Type Material:
Natural History Museum of Los Angeles County under catalog numbers 63565, 63566, 63567, and 63568.
Geological Setting of Type Material:
granitic pegmatite
Associated Minerals at Type Locality:

Synonyms of FalsteriteHide

Other Language Names for FalsteriteHide

German:Falsterit

Fluorescence of FalsteriteHide

Non-fluorescent.

Other InformationHide

Notes:
Falsterite dissolves very easily in cold, dilute HCl.
Health Risks:
No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

References for FalsteriteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Anthony R. Kampf, Stuart J. Mills, W.B. Simmons, James W. Nizamoff, and R.W. Whitmore (2012) Falsterite, Ca2MgMn2+2(Fe2+0.5Fe3+0.5)4Zn4(PO4)8(OH)4(H2O)14, a new secondary phosphate mineral from the Palermo No. 1 pegmatite, North Groton, New Hampshire. American Mineralogist, 97:496–502
Mineralogical Magazine, 75, 2887-2893.

Internet Links for FalsteriteHide

Localities for FalsteriteHide

This 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.

Locality ListHide

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (eg from pseudomorphs.)

All localities listed without proper references should be considered as questionable.
USA
 
  • Maine
    • Cumberland Co.
      • Baldwin
        • West Baldwin
Jim Nizamoff, pers. comm. Feb. 2012; Anthony R. Kampf, Stuart J. Mills, W.B. Simmons, James W. Nizamoff, and R.W. Whitmore (2012) Falsterite, A New Zinc-Bearing Secondary Phosphate From The Palermo #1 Mine, North Groton, New Hampshire. 39th Rochester Symposium abstracts
  • New Hampshire
    • Grafton Co.
      • Groton
Anthony R. Kampf, Stuart J. Mills, W.B. Simmons, James W. Nizamoff, and R.W. Whitmore (2012) Falsterite, Ca2MgMn2+2(Fe2+0.5Fe3+0.5)4Zn4(PO4)8(OH)4(H2O)14, a new secondary phosphate mineral from the Palermo No. 1 pegmatite, North Groton, New Hampshire. American Mineralogist, 97:496–502; Kampf, A. R., Falster, A. U., Simmons, W. B., & Whitmore, R. W. (2013). Nizamoffite, Mn2+ Zn2 (PO4) 2 (H2O) 4, the Mn analogue of hopeite from the Palermo No. 1 pegmatite, North Groton, New Hampshire. American Mineralogist, 98(10), 1893-1898.
Mineral and/or Locality  
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