Hydroxyledgrewite
A valid IMA mineral species
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About Hydroxyledgrewite
Edward S. Grew
Formula:
Ca9(SiO4)4(OH)2
Colour:
Colorless, white in aggregates
Lustre:
Vitreous
Hardness:
5½ - 6
Specific Gravity:
2.918 (Calculated)
Crystal System:
Monoclinic
Member of:
Name:
Named for being the OH-dominant analogue of edgrewite. The root name honors 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.
OH-dominant analogue of edgrewite. 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 are structural analogues of clinohumite-hydroxylclinohumite series.
Unique Identifiers
Mindat ID:
42740
Long-form identifier:
mindat:1:1:42740:7
IMA Classification of Hydroxyledgrewite
Approved
IMA Formula:
Ca9(SiO4)4(OH)2
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 Hydroxyledgrewite
9.AG.50
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 |
|---|---|---|
| Hegr | 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 Hydroxyledgrewite
Vitreous
Transparency:
Transparent
Colour:
Colorless, white in aggregates
Streak:
White
Hardness:
5½ - 6 on Mohs scale
Hardness:
VHN50=352 - 366 kg/mm2 - Vickers
Cleavage:
Distinct/Good
(010)
(010)
Density:
2.918(2) g/cm3 (Calculated)
Optical Data of Hydroxyledgrewite
Type:
Biaxial (+)
RI values:
nα = 1.625(2) nβ = 1.629(2) nγ = 1.635(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 Hydroxyledgrewite
Mindat Formula:
Ca9(SiO4)4(OH)2
Element Weights:
Elements listed:
Crystallography of Hydroxyledgrewite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/b
Cell Parameters:
a = 5.0672(1) Å, b = 11.3545(1) Å, c = 15.3941(2) Å
β = 100.587(1)°
β = 100.587(1)°
Ratio:
a:b:c = 0.446 : 1 : 1.356
Unit Cell V:
870.63 ų
Z:
2
Morphology:
Pinacoids {010}, {100}, {001} and rhombic prisms {110}, {011}, {101}.
Twinning:
Simple and polysynthetic twins on (010).
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.813 Å | (41) |
| 3.028 Å | (100) |
| 2.822 Å | (78) |
| 2.764 Å | (65) |
| 2.624 Å | (55) |
| 1.906 Å | (52) |
| 1.906 Å | (53) |
| 1.890 Å | (55) |
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) |
Type Occurrence of Hydroxyledgrewite
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:
Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, catalogue number 4164/1
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 Hydroxyledgrewite
Other Language Names for Hydroxyledgrewite
Dutch:Hydroxyledgrewiet
German:Hydroxyledgrewit
Relationship of Hydroxyledgrewite to other Species
Member of:
Other Members of Chegemite Subgroup:
| Chegemite | Ca7(SiO4)3(OH)2 | Orth. mmm(2/m2/m2/m) |
| Edgrewite | Ca9(SiO4)4F2 | Mon. 2/m : P21/b |
| Fluorchegemite | Ca7(SiO4)3F2 | Orth. mmm(2/m2/m2/m) |
| 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. | Edgrewite | Ca9(SiO4)4F2 |
| 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.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 Hydroxyledgrewite
mindat.org URL:
https://www.mindat.org/min-42740.html
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References for Hydroxyledgrewite
Reference List:
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2012) New minerals and nomenclature modifications approved in 2012. CNMNC Newsletter No 13. Mineralogical Magazine, 76 (3) 807-817 doi:10.1180/minmag.2012.076.3.26
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 Hydroxyledgrewite
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 | |
| Williams et al. (2012) +2 other references |
| Galuskin et al. (2012) +1 other reference |
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Lakargi Mountain, Upper Chegem volcanic caldera, Chegemsky District, Kabardino-Balkaria, Russia