Hydroxylchondrodite
A valid IMA mineral species
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About Hydroxylchondrodite
Formula:
Mg5(SiO4)2(OH)2
An n=2 member of the humite polysomatic series.
Colour:
Reddish-brown
Lustre:
Vitreous, Sub-Vitreous
Hardness:
6
Specific Gravity:
3.21
Crystal System:
Monoclinic
Member of:
Name:
Named for being the hydroxyl analogue of chondrodite.
Type Locality:
Isostructural with:
Hydroxyl analogue of chondrodite. Very rare.
The type material consists of reddish-brown translucent to cloudy grains.
The type material consists of reddish-brown translucent to cloudy grains.
Unique Identifiers
Mindat ID:
40274
Long-form identifier:
mindat:1:1:40274:5
IMA Classification of Hydroxylchondrodite
Approved
Approval year:
2010
First published:
2010
Type description reference:
Pekov, I. V., Gerasimova, E. I., Chukanov, N. V., Kabalov, Yu. K., Zubkova, N. V., Zadov, A. E., Yapaskurt, V. O., Gekimyants, V. M., Pushcharovskii, D. Yu. (2011) Hydroxylchondrodite Mg5(SiO4)2(OH)2: A new mineral of the humite group and its crystal structure. Doklady Earth Sciences, 436 (2) 230-236 doi:10.1134/s1028334x11020073
Classification of Hydroxylchondrodite
9.AF.45
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.3.6
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
52 : NESOSILICATES Insular SiO4 Groups and O,OH,F,H2O
3 : Insular SiO4 Groups and O, OH, F, and H2O with cations in [6] coordination only
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 |
|---|---|---|
| Hchn | 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 Hydroxylchondrodite
Vitreous, Sub-Vitreous
Transparency:
Translucent
Colour:
Reddish-brown
Streak:
Pale-reddish brown to white
Hardness:
6 on Mohs scale
Tenacity:
Brittle
Cleavage:
None Observed
Parting:
Visible {001}
Fracture:
Irregular/Uneven
Density:
3.21 g/cm3 (Measured) 3.183 g/cm3 (Calculated)
Optical Data of Hydroxylchondrodite
Type:
Biaxial (+)
RI values:
nα = 1.662(3) nβ = 1.669(2) nγ = 1.688(2)
2V:
Measured: 80° , Calculated: 63°
Birefringence:
0.026
Max. Birefringence:
δ = 0.026
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
Optical Extinction:
Z = b
Pleochroism:
Strong
Comments:
X = brown; Y = light brown with grayish green tint; Z = pale grayish greenish brown.
Comments:
Absorption: X > Y > Z.
Chemistry of Hydroxylchondrodite
Mindat Formula:
Mg5(SiO4)2(OH)2
An n=2 member of the humite polysomatic series.
An n=2 member of the humite polysomatic series.
Element Weights:
Elements listed:
Crystallography of Hydroxylchondrodite
Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Setting:
P21/c
Cell Parameters:
a = 7.8847(12) Å, b = 4.7235(8) Å, c = 10.2869(5) Å
β = 109.19(1)°
β = 109.19(1)°
Ratio:
a:b:c = 1.669 : 1 : 2.178
Unit Cell V:
361.83 ų (Calculated from Unit Cell)
Z:
2
Morphology:
As coarse tabular or lens-like crystals and in aggregates.
Twinning:
Thin polysynthetic on {001}.
Crystal Structure
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Data courtesy of the American Mineralogist Crystal Structure Database. Click on an AMCSD ID to view structure
| ID | Species | Reference | Link | Year | Locality | Pressure (GPa) | Temp (K) |
|---|---|---|---|---|---|---|---|
| 0018884 | Hydroxylchondrodite | Yamamoto K (1977) The crystal structure of hydroxyl-chondrodite Acta Crystallographica B33 1481-1485 |  | 1977 | synthetic | 0 | 293 |
| 0002625 | Hydroxylchondrodite | Lager G A, Ulmer P, Miletich R, Marshall W G (2001) O-D...O bond geometry in OD-chondrodite American Mineralogist 86 176-180 |  | 2001 | 0 | 293 |
CIF Raw Data - click here to close
X-Ray Powder Diffraction
Powder Diffraction Data:
| d-spacing | Intensity |
|---|---|
| 3.023 Å | (36) |
| 2.763 Å | (37) |
| 2.673 Å | (37) |
| 2.621 Å | (44) |
| 2.518 Å | (59) |
| 2.260 Å | (74) |
| 1.740 Å | (100) |
| 1.489 Å | (46) |
Reference:
Pekov, I. V., Gerasimova, E. I., Chukanov, N. V., Kabalov, Yu. K., Zubkova, N. V., Zadov, A. E., Yapaskurt, V. O., Gekimyants, V. M., Pushcharovskii, D. Yu. (2011) Hydroxylchondrodite Mg5(SiO4)2(OH)2: A new mineral of the humite group and its crystal structure. Doklady Earth Sciences, 436 (2) 230-236 doi:10.1134/s1028334x11020073
Geological Environment
Paragenetic Mode(s):
| Paragenetic Mode | Earliest Age (Ga) |
|---|---|
| Stage 4b: Highly evolved igneous rocks | >3.0 |
| 35 : Ultra-alkali and agpaitic igneous rocks |
Geological Setting:
In the contact zone between magnesium skarn and marble.
Type Occurrence of Hydroxylchondrodite
General Appearance of Type Material:
Coarsely formed tabular or lens-like crystals with sizes up to 0.5 × 1.5 × 1.5 cm and their intergrowths up to 2 cm.
Place of Conservation of Type Material:
Fersman Mineralogical Museum, Russian Academy of Sciences, Moscow, Russia, no.3986/1
Geological Setting of Type Material:
Contact zone between magnesium skarn and host marble.
Associated Minerals at Type Locality:
Reference:
Pekov, I. V., Gerasimova, E. I., Chukanov, N. V., Kabalov, Yu. K., Zubkova, N. V., Zadov, A. E., Yapaskurt, V. O., Gekimyants, V. M., Pushcharovskii, D. Yu. (2011) Hydroxylchondrodite Mg5(SiO4)2(OH)2: A new mineral of the humite group and its crystal structure. Doklady Earth Sciences, 436 (2) 230-236 doi:10.1134/s1028334x11020073
Synonyms of Hydroxylchondrodite
Other Language Names for Hydroxylchondrodite
Relationship of Hydroxylchondrodite to other Species
Member of:
Other Members of Humite Subgroup:
| Chondrodite | Mg5(SiO4)2F2 | Mon. 2/m : P21/b |
| Clinohumite | Mg9(SiO4)4F2 | Mon. 2/m : P21/b |
| Humite | Mg7(SiO4)3F2 | Orth. mmm(2/m2/m2/m) : Pnma |
| Hydroxylclinohumite | Mg9(SiO4)4(OH)2 | Mon. 2/m : P21/b |
| Norbergite | Mg3(SiO4)F2 | Orth. mmm(2/m2/m2/m) |
| 'Unnamed (OH-analogue of humite)' | Mg7(SiO4)3(OH)2 | Orth. |
Common Associates
Associations Based on Photo Data:
Related Minerals - Strunz-mindat Grouping
| 9.AF. | Chegemite | Ca7(SiO4)3(OH)2 |
| 9.AF. | Jingwenite-(Y) | YAlV4+(SiO4)O2(OH)2 |
| 9.AF. | Barwoodite | Mn2+6Nb5+(SiO4)2O3(OH)3 |
| 9.AF.05 | Sillimanite | Al2(SiO4)O |
| 9.AF.05 | 'Xenolite' | Al10Si8O31 |
| 9.AF.10 | Kanonaite | Mn3+Al(SiO4)O |
| 9.AF.10 | Andalusite | Al2(SiO4)O |
| 9.AF.15 | Kyanite | Al2(SiO4)O |
| 9.AF.20 | Krieselite | Al2(GeO4)F2 |
| 9.AF.20 | Mullite | Al4+2xSi2-2xO10-x |
| 9.AF.23 | Boromullite | Al9BSi2O19 |
| 9.AF.25 | Yoderite | Mg(Al,Fe3+)3(SiO4)2O(OH) |
| 9.AF.30 | Zincostaurolite | Zn2Al9Si4O23(OH) |
| 9.AF.30 | Staurolite | Fe2+2Al9Si4O23(OH) |
| 9.AF.30 | Magnesiostaurolite | Mg(Mg,Li)3(Al,Mg)18Si8O44(OH)4 |
| 9.AF.35 | Topaz | Al2(SiO4)(F,OH)2 |
| 9.AF.40 | Norbergite | Mg3(SiO4)F2 |
| 9.AF.45 | Chondrodite | Mg5(SiO4)2F2 |
| 9.AF.45 | Kumtyubeite | Ca5(SiO4)2F2 |
| 9.AF.45 | Reinhardbraunsite | Ca5(SiO4)2(OH,F)2 |
| 9.AF.45 | Alleghanyite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.50 | 'Unnamed (Ca-analogue of Humite)' | Ca7(SiO4)4F2 |
| 9.AF.50 | Humite | Mg7(SiO4)3F2 |
| 9.AF.50 | Manganhumite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.50 | 'Unnamed (OH-analogue of humite)' | Mg7(SiO4)3(OH)2 |
| 9.AF.50 | Fluorchegemite | Ca7(SiO4)3F2 |
| 9.AF.55 | Hydroxylclinohumite | Mg9(SiO4)4(OH)2 |
| 9.AF.55 | Clinohumite | Mg9(SiO4)4F2 |
| 9.AF.55 | Sonolite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.60 | Leucophoenicite | Mn2+7(SiO4)3(OH)2 |
| 9.AF.65 | Ribbeite | Mn2+5(SiO4)2(OH)2 |
| 9.AF.70 | Jerrygibbsite | Mn2+9(SiO4)4(OH)2 |
| 9.AF.75 | Franciscanite | Mn2+6(V5+,◻)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Scorticoite | Mn6(Sb,◻)Σ2(SiO4)2O3(OH)3 |
| 9.AF.75 | Welinite | Mn2+6(W6+,Mg)2(SiO4)2(O,OH)6 |
| 9.AF.75 | Örebroite | Mn2+3(Sb5+,Fe3+)(SiO4)(O,OH)3 |
| 9.AF.80 | Ellenbergerite | Mg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10 |
| 9.AF.85 | Magnesiochloritoid | MgAl2O(SiO4)(OH)2 |
| 9.AF.85 | Ottrélite | Mn2+Al2O(SiO4)(OH)2 |
| 9.AF.85 | Chloritoid | Fe2+Al2O(SiO4)(OH)2 |
| 9.AF.90 | Olmiite | CaMn2+[SiO3(OH)](OH) |
| 9.AF.90 | Poldervaartite | CaCa[SiO3(OH)](OH) |
| 9.AF.95 | Pilawite-(Y) | Ca2Y2Al4(SiO4)4O2(OH)2 |
Fluorescence of Hydroxylchondrodite
Unknown
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 Hydroxylchondrodite
mindat.org URL:
https://www.mindat.org/min-40274.html
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References for Hydroxylchondrodite
Reference List:
Yamamoto, K., Akimoto, S. (1977) The system MgO-SiO 2 -H 2 O at high pressures and temperatures; stability field for hydroxyl-chondrodite, hydroxyl-clinohumite and 10 A o -phase. American Journal of Science, 277 (3) 288-312 doi:10.2475/ajs.277.3.288
Lager, George A., Ulmer, Peter, Miletich, Ronald, Marshall, William G. (2001) O-D···O bond geometry in OD-chondrodite. American Mineralogist, 86 (1) 176-180 doi:10.2138/am-2001-0119
Liu, Zhenxian, Lager, George A., Hemley, Russell J., Ross, Nancy L. (2003) Synchrotron infrared spectroscopy of OH-chondrodite and OH-clinohumite at high pressure. American Mineralogist, 88 (10) 1412-1415 doi:10.2138/am-2003-1003
Williams, P. A., Hatert, F., Pasero, M., Mills, S. J. (2010) IMA Commission on New Minerals, Nomenclature and Classification (CNMNC) CNMNC Newsletter No 4. Mineralogical Magazine, 74 (4) 797-800 doi:10.1180/s0026461x00038925
Pekov, I. V., Gerasimova, E. I., Chukanov, N. V., Kabalov, Yu. K., Zubkova, N. V., Zadov, A. E., Yapaskurt, V. O., Gekimyants, V. M., Pushcharovskii, D. Yu. (2011) Hydroxylchondrodite Mg5(SiO4)2(OH)2: A new mineral of the humite group and its crystal structure. Doklady Earth Sciences, 436 (2) 230-236 doi:10.1134/s1028334x11020073
Localities for Hydroxylchondrodite
Showing 2 localities.
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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 | |
| Andrey Gorshkov collection |
| Williams et al. (2010) +1 other reference |
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Perovskitovaya Mine, Zlatoust, Chelyabinsk Oblast, Russia