Edgrewite
A valid IMA mineral species
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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
Member of:
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.
Type Locality:
Isostructural with:
F-dominant analogue of hydroxyledgrewite. Edgrewite and hydroxyledgrewite form a continuous series between the F and (OH) dominant end members, where the analysed samples from the type locality show between 74% and 31% of the F dominant end member (edgrewite) Members of the edgrewite-hydroxyledgrewite series are structural analogues of clinohumite-hydroxylclinohumite series.
Unique Identifiers
Mindat ID:
42491
Long-form identifier:
mindat:1:1:42491:4
IMA Classification of Edgrewite
Approved
IMA Formula:
Ca9(SiO4)4F2
Approval year:
2011
First published:
2012
Type description reference:
Galuskin, E. V., Lazic, B., Armbruster, T., Galuskina, I. O., Pertsev, N. N., Gazeev, V. M., Wlodyka, R., Dulski, M., Dzierzanowski, 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 (11) 1998-2006 doi:10.2138/am.2012.4161
Classification of Edgrewite
9.AG.
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
G : Nesosilicates with additional anions; cations in > [6] +- [6] coordination
Mineral Symbols
As of 2021 there are now IMA–CNMNC approved mineral symbols (abbreviations) for each mineral species, useful for tables and diagrams.
| Symbol | Source | Reference for Standard |
|---|---|---|
| Egr | IMA–CNMNC | Warr, L.N. (2021). IMA–CNMNC approved mineral symbols. Mineralogical Magazine, 85(3), 291-320. doi:10.1180/mgm.2021.43 |
Physical Properties of Edgrewite
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)
(010)
Density:
2.919(1) g/cm3 (Calculated)
Optical Data of Edgrewite
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
Based on recorded range of RI values above.
Based on recorded range of RI values above.
Interference Colours:
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
The colours simulate birefringence patterns seen in thin section under crossed polars. They do not take into account mineral colouration or opacity.
Michel-Levy Bar The default colours simulate the birefringence range for a 30 µm thin-section thickness. Adjust the slider to simulate a different thickness.
Grain Simulation You can rotate the grain simulation to show how this range might look as you rotated a sample under crossed polars. Each grain retains its interference colour (retardation) while its brightness falls to black at extinction and reaches a maximum between extinction positions.
Surface Relief:
Moderate
Dispersion:
r > v, medium
Chemistry of Edgrewite
Mindat Formula:
Ca9(SiO4)4F2
Element Weights:
Elements listed:
Crystallography of Edgrewite
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)°
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 Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 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) |
Reference:
Galuskin, E. V., Lazic, B., Armbruster, T., Galuskina, I. O., Pertsev, N. N., Gazeev, V. M., Wlodyka, R., Dulski, M., Dzierzanowski, 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 (11) 1998-2006 doi:10.2138/am.2012.4161
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 3a: Earth’s earliest Hadean crust | >4.50 |
| 9 : Lava/xenolith minerals (hornfels, sanidinite facies) | |
| Stage 10a: Neoproterozoic oxygenation/terrestrial biosphere | <0.6 |
| 51 : Pyrometamorphic minerals (see also #54 and #56) | <0.36 |
Type Occurrence of Edgrewite
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., Wlodyka, R., Dulski, M., Dzierzanowski, 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 (11) 1998-2006 doi:10.2138/am.2012.4161
Synonyms of Edgrewite
Other Language Names for Edgrewite
Relationship of Edgrewite to other Species
Member of:
Other Members of Chegemite Subgroup:
| Chegemite | Ca7(SiO4)3(OH)2 | Orth. mmm(2/m2/m2/m) |
| Fluorchegemite | Ca7(SiO4)3F2 | Orth. mmm(2/m2/m2/m) |
| Hydroxyledgrewite | Ca9(SiO4)4(OH)2 | Mon. 2/m : P21/b |
| Kumtyubeite | Ca5(SiO4)2F2 | Mon. 2/m : P21/b |
| Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 | Mon. 2/m : P21/b |
Related Minerals - Strunz-mindat Grouping
| 9.AG. | Aluminotaipingite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4F3 |
| 9.AG. | 'Ivanyukite-Na-T' | Na2Ti4(SiO4)3(OH)O3 · 7H2O |
| 9.AG. | 'Ivanyukite-Na-C' | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG.02 | Gatedalite | ZrMn2+2Mn3+4SiO12 |
| 9.AG.05 | Abswurmbachite | CuMn3+6(SiO4)O8 |
| 9.AG.05 | Neltnerite | CaMn3+6(SiO4)O8 |
| 9.AG.05 | Skogbyite | Zr(Mg2Mn3+4)SiO12 |
| 9.AG.05 | Braunite | Mn2+Mn3+6(SiO4)O8 |
| 9.AG.05 | 'Braunite-II' | Ca(Mn3+,Fe)14(SiO4)O20 |
| 9.AG.10 | Långbanite | Mn2+4Mn3+9Sb5+O16(SiO4)2 |
| 9.AG.12 | Taipingite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3[SiO3(OH)]4F3 |
| 9.AG.15 | Żabińskiite | Ca[Al0.5(Ta,Nb)0.5)]O(SiO4) |
| 9.AG.15 | Titanite | CaTiO(SiO4) |
| 9.AG.15 | Vanadomalayaite | CaVO(SiO4) |
| 9.AG.15 | Natrotitanite | (Na0.5Y0.5)TiO(SiO4) |
| 9.AG.15 | Malayaite | CaSnO(SiO4) |
| 9.AG.20 | Ferricerite-(LaCa) | (La6Ca3)◻Fe3+(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Aluminocerite-(CeCa) | (Ce6Ca3)◻Al(SiO4)3[SiO3(OH)]4(OH)3 |
| 9.AG.20 | Cerite-(CeCa) | (Ce7Ca2)◻Mg(SiO4)3(SiO3OH)4(OH)3 |
| 9.AG.20 | Nipeiite-(Ce) | Ce9Fe3+(SiO4)6[SiO3(OH)](OH)3 |
| 9.AG.25 | 'Yftisite-(Y)' | (Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6 |
| 9.AG.25 | Mieite-(Y) | Y4Ti(SiO4)2O[F,(OH)]6 |
| 9.AG.25 | Trimounsite-(Y) | Y2Ti2(SiO4)O5 |
| 9.AG.30 | Sitinakite | KNa2Ti4(SiO4)2O5(OH) · 4H2O |
| 9.AG.35 | Kittatinnyite | Ca2Mn2Mn(SiO4)2(OH)4 · 9H2O |
| 9.AG.40b | Paranatisite | Na2Ti(SiO4)O |
| 9.AG.40a | Natisite | Na2Ti(SiO4)O |
| 9.AG.45 | Törnebohmite-(Ce) | Ce2Al(SiO4)2(OH) |
| 9.AG.45 | Törnebohmite-(La) | La2Al(SiO4)2(OH) |
| 9.AG.50 | Ivanyukite-Na | Na2Ti4(SiO4)3(OH)2O2 · 6H2O |
| 9.AG.50 | Ivanyukite-K | K2Ti4(SiO4)3(OH)2O2 · 9H2O |
| 9.AG.50 | Ivanyukite-Cu | CuTi4(SiO4)3(OH)2O2 · 7H2O |
| 9.AG.50 | Kuliokite-(Y) | Y4Al(SiO4)2(OH)2F5 |
| 9.AG.50 | Hydroxyledgrewite | Ca9(SiO4)4(OH)2 |
| 9.AG.52 | Ulfanderssonite-(Ce) | (Ce15Ca)Σ16Mg2(SiO4)10(SiO3OH)(OH,F)5Cl3 |
| 9.AG.55 | Chantalite | CaAl2(SiO4)(OH)4 |
| 9.AG.60 | Vuagnatite | CaAl(SiO4)(OH) |
| 9.AG.60 | Mozartite | CaMn3+(SiO4)(OH) |
| 9.AG.65 | Hatrurite | Ca3(SiO4)O |
| 9.AG.70 | Jasmundite | Ca11(SiO4)4O2S |
| 9.AG.75 | Afwillite | Ca3[SiO4][SiO2(OH)2] · 2H2O |
| 9.AG.80 | Bultfonteinite | Ca2(HSiO4)F · H2O |
| 9.AG.85 | Zoltaiite | BaV4+2V3+12(SiO4)2O19 |
| 9.AG.90 | Tranquillityite | (Fe2+,Ca)8(Zr,Y)2Ti3(SiO4)3O12 |
Other Information
Health Risks:
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 Edgrewite
mindat.org URL:
https://www.mindat.org/min-42491.html
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References for Edgrewite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2011) New minerals and nomenclature modifications approved in 2011. CNMNC Newsletter No 11. Mineralogical Magazine, 75 (6) 2887-2893 doi:10.1180/minmag.2011.075.6.2887
Galuskin, E. V., Lazic, B., Armbruster, T., Galuskina, I. O., Pertsev, N. N., Gazeev, V. M., Wlodyka, R., Dulski, M., Dzierzanowski, 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 (11) 1998-2006 doi:10.2138/am.2012.4161
Localities for Edgrewite
Showing 2 localities.
symbol to view information about a locality.
The Locality List
- This locality has map coordinates listed.
- This locality has estimated coordinates.
ⓘ - Click for references and 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).
All localities listed without proper references should be considered as questionable.
Russia | |
| Galuskin et al. (2012) |
| Williams et al. (2011) +1 other reference |
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