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Edgrewite

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03980070015978821016783.jpg
Edward S. Grew
Formula:
Ca9(SiO4)4F2
Colour:
Colorless, white in aggregates
Lustre:
Vitreous
Hardness:
5½ - 6½
Specific Gravity:
2.919 (Calculated)
Crystal System:
Monoclinic
Name:
Named in 2011 by E. V. Galuskin, T. Armbruster, N. N. Pertsev, I. O. Galuskina, B. Lazic, V. M. Gazeev, R. Włodyka, M. Dulski, P. Dzierzanowski, A. E. Zadov, and L. Dubrovinsky in honor of mineralogist Edward Sturgis Grew (b. 1944, Boston, Massachusetts, USA), University of Maine, whose research specializes in the granulite-facies rocks of Antarctica and in the minerals of Li, Be and B. Dr. Grew has also chaired several IMA nomenclature sub-committees, including the garnet group and the sapphirine group, as well as served as associate editor for the American Mineralogist, Canadian Mineralogist, Mineralogical Magazine and European Journal of Mineralogy. The garnet-group mineral priscillagrewite-(Y) is named for his wife.
F-dominant analogue of hydroxyledgrewite. Members of the edgrewite-hydroxyledgrewite series are structural analogues of clinohumite-hydroxylclinohumite series.


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Classification of EdgrewiteHide

Approved
Approval Year:
2011
First Published:
2012
9.AG.

9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination

Physical Properties of EdgrewiteHide

Vitreous
Transparency:
Transparent
Colour:
Colorless, white in aggregates
Streak:
White
Hardness:
5½ - 6½ on Mohs scale
Hardness:
VHN50=366 kg/mm2 - Vickers
Cleavage:
Distinct/Good
(010)
Density:
2.919(1) g/cm3 (Calculated)

Optical Data of EdgrewiteHide

Type:
Biaxial (+)
RI values:
nα = 1.621(2) nβ = 1.625(2) nγ = 1.631(2)
2V:
Measured: 80° (5), Calculated: 78.7°
Max Birefringence:
δ = 0.010
Image shows birefringence interference colour range (at 30µm thickness)
and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v, medium

Chemical Properties of EdgrewiteHide

Formula:
Ca9(SiO4)4F2
IMA Formula:
Ca9(SiO4)4F2

Crystallography of EdgrewiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 5.0687(1) Å, b = 11.3579(1) Å, c = 15.4004(2) Å
α = 100.598(1)°
Ratio:
a:b:c = 0.446 : 1 : 1.356
Unit Cell V:
871.47 ų
Z:
2
Morphology:
Pinacoids {010}, {100}, {001} and rhombic prisms {110}, {011}, {101}
Twinning:
Simple and polysynthetic twins on (010)
Comment:
Non-standard space-group setting P21/b.

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.542 Å(51)
3.029 Å(100)
2.863 Å(42)
2.823 Å(79)
2.765 Å(64)
2.657 Å(44)
2.625 Å(55)
1.907 Å(59)

Type Occurrence of EdgrewiteHide

General Appearance of Type Material:
Occur sparingly in zones in a matrix of hydroxylellestadite. Largely altered to jennite in places with admixed zeophyllite and trabzonite, and are preserved as elongate relics mostly 0.1–0.4 mm long in the central part of atoll-like pseudomorphs
Place of Conservation of Type Material:
Type material is deposited in the collections of the Museum of Natural History, Bern, Switzerland, catalogue number NMBE 41086 and in the Fersman Mineralogical Museum in Moscow, Russia, number 4162/1.
Geological Setting of Type Material:
Xenoliths of carbonate-silicate rock altered to skarn within ignimbrites
Associated Minerals at Type Locality:
Reference:
Galuskin, E.V., Lazic, B., Armbruster, T., Galuskina, I.O., Pertsev, N.N., Gazeev, V.M., Włodyka, R, Dulski, M., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L.S. (2012) Edgrewite Ca9(SiO4)4F2 – hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist: 97: 1998-2006.

Synonyms of EdgrewiteHide

Relationship of Edgrewite to other SpeciesHide

Other Members of this group:
ChegemiteCa7(SiO4)3(OH)2Orth. mmm (2/m 2/m 2/m)
FluorchegemiteCa7(SiO4)3F2Orth. mmm (2/m 2/m 2/m)
KumtyubeiteCa5(SiO4)2F2Mon. 2/m : P21/b
ReinhardbraunsiteCa5(SiO4)2(OH,F)2Mon. 2/m : P21/b

Related Minerals - Nickel-Strunz GroupingHide

9.AG.05AbswurmbachiteCuMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05BrauniteMn2+Mn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05NeltneriteCaMn3+6(SiO4)O8Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.05Braunite-IICaMn3+14(SiO4)O20Tet. 4/mmm (4/m 2/m 2/m) : I41/acd
9.AG.10LångbaniteMn2+4Mn3+9Sb5+O16(SiO4)2Trig. 3m : P3m1
9.AG.15MalayaiteCaSn(SiO4)OMon.
9.AG.15TitaniteCaTi(SiO4)OMon. 2/m : P21/b
9.AG.15VanadomalayaiteCaV4+(SiO4)OMon.
9.AG.15Natrotitanite(Na0.5Y0.5)Ti(SiO4)OMon. 2/m : B2/b
9.AG.15ŻabińskiiteCa[Al0.5(Ta,Nb)0.5)](SiO4)OTric. 1
9.AG.20Cerite-(Ce)(Ce,Ca)9(Mg,Fe)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
9.AG.20Cerite-(La)(La,Ce,Ca)9(Fe,Ca,Mg)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
9.AG.20Aluminocerite-(Ce)(Ce,La,Ca)9(Al,Fe3+)(SiO4)3(HSiO4)4(OH)3Trig. 3m : R3c
9.AG.25Trimounsite-(Y)Y2Ti2(SiO4)O5Mon.
9.AG.25Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
9.AG.25Mieite-(Y)Y4Ti(SiO4)2O[F,(OH)]6Orth. mmm (2/m 2/m 2/m) : Cmcm
9.AG.30SitinakiteKNa2Ti4(SiO4)2O5(OH) · 4H2OTet.
9.AG.35KittatinnyiteCa2Mn2Mn(SiO4)2(OH)4 · 9H2OHex.
9.AG.40aNatisiteNa2Ti(SiO4)OTet.
9.AG.40bParanatisiteNa2Ti(SiO4)OOrth.
9.AG.45Törnebohmite-(Ce)(Ce,La)2Al(SiO4)2(OH)Mon. 2/m : P21/b
9.AG.45Törnebohmite-(La)(La,Ce)2Al(SiO4)2(OH)
9.AG.50Kuliokite-(Y)Y4Al(SiO4)2(OH)2F5Tric. 1 : P1
9.AG.55ChantaliteCaAl2(SiO4)(OH)4Tet. 4/m : I41/a
9.AG.60MozartiteCaMn3+(SiO4)(OH)Orth. 2 2 2 : P21 21 21
9.AG.60VuagnatiteCaAl(SiO4)(OH)Orth.
9.AG.65HatruriteCa3(SiO4)OTrig.
9.AG.70JasmunditeCa11(SiO4)4O2STet. 4 2m : I4m2
9.AG.75AfwilliteCa3(HSiO4)2 · 2H2OMon. m : Bb
9.AG.80BultfonteiniteCa2(HSiO4)F · H2OTric.
9.AG.85ZoltaiiteBaV4+2V3+12(SiO4)2O19Trig. 3 : P3
9.AG.90Tranquillityite(Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12Hex.

Other InformationHide

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 EdgrewiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Galuskin, E.V., Armbruster, T., Pertsev, N.N., Galuskina, I.O., Lazic, B., Gazeev, V.M., Włodyka, R., Dulski, M., Dzierzanowski, P., Zadov, A.E. and Dubrovinsky, L. (2011) Edgrewite, IMA 2011-058. CNMNC Newsletter No. 11, December 2011, page 2888. Mineralogical Magazine: 75: 2887-2893.
Galuskin, E.V., Lazic, B., Armbruster, T., Galuskina, I.O., Pertsev, N.N., Gazeev, V.M., Włodyka, R, Dulski, M., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L.S. (2012) Edgrewite Ca9(SiO4)4F2 – hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist: 97: 1998-2006.

Internet Links for EdgrewiteHide

Localities for EdgrewiteHide

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.
Russia (TL)
 
  • Kabardino-Balkaria
    • Baksan Valley
      • Upper Chegem volcanic caldera (Verkhnechegemskaya caldera)
        • Lakargi Mountain
Galuskin, E.V., Armbruster, T., Pertsev, N.N., Galuskina, I.O., Lazic, B., Gazeev, V.M., Włodyka, R., Dulski, M., Dzierzanowski, P., Zadov, A.E. and Dubrovinsky, L. (2011) Edgrewite, IMA 2011-058. CNMNC Newsletter No. 11, December 2011, page 2888; Galuskin, E.V., Lazic, B., Armbruster, T., Galuskina, I.O., Pertsev, N.N., Gazeev, V.M., Włodyka, R, Dulski, M., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L.S. (2012): Edgrewite Ca9(SiO4)4F2 – hydroxyledgrewite Ca9(SiO4)4(OH)2, a new series of calcium humite-group minerals from altered xenoliths in the ignimbrite of Upper Chegem caldera, Northern Caucasus, Kabardino-Balkaria, Russia. American Mineralogist, 97, 1998-2006.
 
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