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Hydroxyledgrewite

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Formula:
Ca9(SiO4)4(OH)2
Colour:
Colorless
Hardness:
5½ - 6½
Crystal System:
Monoclinic
Name:
Named in honor of mineralogist Edward S. Grew, University of Maine, whose research specializes in the stability of high-pressure silicates and in B and Be crystal chemistry.
OH-dominant analogue of edgrewite. Members of the edgrewite-hydroxyledgrewite are structural analogues of clinohumite-hydroxylclinohumite series.


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Classification of HydroxyledgrewiteHide

Approved
Approval Year:
2012

Physical Properties of HydroxyledgrewiteHide

Colour:
Colorless
Hardness:
5½ - 6½ on Mohs scale
Hardness:
VHN100=352 - 366 - Vickers

Optical Data of HydroxyledgrewiteHide

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
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 HydroxyledgrewiteHide

Formula:
Ca9(SiO4)4(OH)2
IMA Formula:
Ca9(SiO4)4(OH)2

Crystallography of HydroxyledgrewiteHide

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)°
Ratio:
a:b:c = 0.446 : 1 : 1.356
Unit Cell V:
870.63 ų (Calculated from Unit Cell)

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
3.813 (41)
3.028 (100)
2.822 (78)
2.764 (65)
2.624 (55)
1.906 (52)
1.906 (53)
1.890 (55)

Type Occurrence of HydroxyledgrewiteHide

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:

Synonyms of HydroxyledgrewiteHide

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 HydroxyledgrewiteHide

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., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L. (2012) Hydroxyledgrewite, IMA 2011-113. CNMNC Newsletter No. 13, June 2012, page 812. Mineralogical Magazine: 76: 807-817.

Internet Links for HydroxyledgrewiteHide

Localities for HydroxyledgrewiteHide

ⓘ - 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
 
  • Kabardino-Balkarian Republic
    • Baksan Valley
Galuskin, E.V., Armbruster, T., Pertsev, N.N., Galuskina, I.O., Lazic, B., Gazeev, V.M., Włodyka, R., Dulski, M., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L. (2012) Hydroxyledgrewite, IMA 2011-113. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817.
        • Lakargi Mt.
Galuskin, E.V., Armbruster, T., Pertsev, N.N., Galuskina, I.O., Lazic, B., Gazeev, V.M., Włodyka, R., Dulski, M., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L. (2012) Hydroxyledgrewite, IMA 2011-113. CNMNC Newsletter No. 13, June 2012, page 812; Galuskin, E.V., Armbruster, T., Pertsev, N.N., Galuskina, I.O., Lazic, B., Gazeev, V.M., Włodyka, R., Dulski, M., Dzierżanowski, P., Zadov, A.E., Dubrovinsky, L. (2012) Hydroxyledgrewite, IMA 2011-113. CNMNC Newsletter No. 13, June 2012, page 812; Mineralogical Magazine, 76, 807-817.
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