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Chondrodite

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Formula:
(Mg,Fe2+)5(SiO4)2(F,OH)2
System:
Monoclinic
Colour:
Yellow, Red or Brown.
Lustre:
Vitreous, Resinous
Hardness:
6 - 6½
Name:
Named in 1817 by Baron Abraham Constantin Mouradgea d'Ohsson from the Greek for "grain" in allusion to its habit of occurring in isolated grains.
Dimorph of:
May be confused with clinohumite.

Visit gemdat.org for gemological information about Chondrodite.

Classification of Chondrodite

Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
9.AF.45

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
52.3.2b.2

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
17.1.10

17 : Silicates Containing other Anions
1 : Silicates with fluoride (not containing Al)
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First Recorded Occurrence of Chondrodite

Year of Discovery:
1817

Occurrences of Chondrodite

Geological Setting:
In contact metamorphic rocks, carbonatites

Physical Properties of Chondrodite

Vitreous, Resinous
Diaphaneity (Transparency):
Transparent, Translucent
Colour:
Yellow, Red or Brown.
Streak:
White-gray, yellow
Hardness (Mohs):
6 - 6½
Tenacity:
Brittle
Cleavage:
Poor/Indistinct
Indistinct on {100}
Parting:
on {001}
Density:
3.16 - 3.26 g/cm3 (Measured)    3.177 g/cm3 (Calculated)

Crystallography of Chondrodite

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
P21/b
Cell Parameters:
a = 7.84Å, b = 4.73Å, c = 10.25Å
β = 109°
Ratio:
a:b:c = 1.658 : 1 : 2.167
Unit Cell Volume:
V 359.39 ų (Calculated from Unit Cell)
Z:
2
Morphology:
Typically flattened, rounded grains, massive
Twinning:
On {001}

Crystallographic forms of Chondrodite

Crystal Atlas:
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Chondrodite no.11 - Goldschmidt (1913-1926)
Chondrodite no.12 - Goldschmidt (1913-1926)
3d models and HTML5 code kindly provided by www.smorf.nl.

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Transparency
Opaque | Translucent | Transparent

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X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Data courtesy of RRUFF project at University of Arizona, used with permission.

Optical Data of Chondrodite

Type:
Biaxial (+)
RI values:
nα = 1.592 - 1.643 nβ = 1.602 - 1.655 nγ = 1.619 - 1.675
2V:
Measured: 64° to 90°, Calculated: 76° to 78°
Max Birefringence:
δ = 0.027 - 0.032
Image shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:
Moderate
Dispersion:
r > v weak to strong
Pleochroism:
Weak
Comments:
X= colorless, very pale yellow, brownish yellow
Y= colorless, yellow green
Z= colorless, pale green

Chemical Properties of Chondrodite

Formula:
(Mg,Fe2+)5(SiO4)2(F,OH)2
Idealised Formula:
Mg5(SiO4)2F,2
Essential elements:
All elements listed in formula:
Common Impurities:
Ti,Al,Mn

Relationship of Chondrodite to other Species

Other Members of Group:
ClinohumiteMg9(SiO4)4F2
Humite(Mg,Fe2+)7(SiO4)3(F,OH)2
HydroxylchondroditeMg5(SiO4)2(OH)2
HydroxylclinohumiteMg9(SiO4)4(OH)2
NorbergiteMg3(SiO4)(F,OH)2
9.AF.05SillimaniteAl2(SiO4)O
9.AF.10AndalusiteAl2(SiO4)O
9.AF.10KanonaiteMn3+Al(SiO4)O
9.AF.15KyaniteAl2(SiO4)O
9.AF.20MulliteAl4+2xSi2-2xO10-x
9.AF.20Krieselite(Al,Ga)2(GeO4)(OH)2
9.AF.23BoromulliteAl9BSi2O19
9.AF.25YoderiteMg(Al,Fe3+)3(SiO4)2O(OH)
9.AF.30Magnesiostaurolite(Mg,Li,Fe2+)1.5-2Al9(SiO4)4O6(OH)2
9.AF.30Staurolite(Fe2+,Mg,Zn)1.5-2Al9(SiO4)4O6(OH,O)2
9.AF.30Zincostaurolite(Zn,Li,Fe2+,Mg)1.5-2Al9(SiO4)4O6(OH)2
9.AF.35TopazAl2(SiO4)(F,OH)2
9.AF.40NorbergiteMg3(SiO4)(F,OH)2
9.AF.45AlleghanyiteMn52+(SiO4)2(OH)2
9.AF.45ReinhardbraunsiteCa5(SiO4)2(OH,F)2
9.AF.45KumtyubeiteCa5(SiO4)2F2
9.AF.45HydroxylchondroditeMg5(SiO4)2(OH)2
9.AF.50Humite(Mg,Fe2+)7(SiO4)3(F,OH)2
9.AF.50Manganhumite(Mn2+,Mg)7(SiO4)3(OH)2
9.AF.50Unnamed (Ca-analogue of Humite)Ca7(SiO4)4F2
9.AF.55ClinohumiteMg9(SiO4)4F2
9.AF.55SonoliteMn92+(SiO4)4(OH,F)2
9.AF.55HydroxylclinohumiteMg9(SiO4)4(OH)2
9.AF.60LeucophoeniciteMn72+(SiO4)3(OH)2
9.AF.65Ribbeite(Mn2+,Mg)5(SiO4)2(OH)2
9.AF.70JerrygibbsiteMn92+(SiO4)4(OH)2
9.AF.75FranciscaniteMn62+(V5+,☐)2(SiO4)2(O,OH)6
9.AF.75ÖrebroiteMn32+(Sb5+,Fe3+)(SiO4)(O,OH)3
9.AF.75WeliniteMn62+(W6+,Mg)2(SiO4)2(O,OH)6
9.AF.80EllenbergeriteMg6(Mg,Ti,Zr,◻)2(Al,Mg)6Si8O28(OH)10
9.AF.85Chloritoid(Fe2+,Mg,Mn2+)Al2(SiO4)O(OH)2
9.AF.85MagnesiochloritoidMgAl2(SiO4)O(OH)2
9.AF.85Ottrélite(Mn2+,Fe2+,Mg)Al2(SiO4)O(OH)2
9.AF.90PoldervaartiteCaCa[SiO3(OH)](OH)
9.AF.90OlmiiteCaMn2+[SiO3(OH)](OH)
17.1.1HectoriteNa0.3(Mg,Li)3(Si4O10)(F,OH)2
17.1.3AgrelliteNaCa2Si4O10F
17.1.4Fluorapophyllite-(Na)NaCa4(Si8O20)F · 8H2O
17.1.5Fluorapophyllite-(K)KCa4(Si8O20)(F,OH) · 8H2O
17.1.6Hydroxyapophyllite-(K)KCa4(Si8O20)(OH,F) · 8H2O
17.1.7HsianghualiteCa3Li2(Be3Si3O12)F2
17.1.8LeucophaniteNaCaBeSi2O6F
17.1.9NorbergiteMg3(SiO4)(F,OH)2
17.1.11Humite(Mg,Fe2+)7(SiO4)3(F,OH)2
17.1.12ClinohumiteMg9(SiO4)4F2
17.1.13CanasiteK2Na4Ca5(Si12O30(OH,F)4
17.1.14Charoite(K,Sr)15-16(Ca,Na)32[Si6O11(O,OH)6]2[Si12O18(O,OH)12]2[Si17O25(O,OH)18]2(OH,F)4 · ~3H2O
17.1.15CuspidineCa4(Si2O7)(F,OH)2
17.1.16BultfonteiniteCa2(HSiO4)F · H2O
17.1.17ZeophylliteCa13(Si10O28)F10 · 6H2O
17.1.18Rowlandite-(Y)(Y,Ce)4Fe2+(Si2O7)2F2 (?)
17.1.19Yuksporite(K,Ba)NaCa2(Si,Ti)4O11(F,OH) · H2O
17.1.20Yftisite-(Y)(Y,Dy,Er)4(Ti,Sn)(SiO4)2O(F,OH)6
17.1.21Mosandrite(◻,Ca,Na)3(Ca,REE)4Ti(Si2O7)2[H2O,OH,F]4 · H2O
17.1.22Hiortdahlite(Ca,Na)3(Zr,Ti)(Si2O7)(O,OH,F)2
17.1.23BurpaliteNa2CaZr(Si2O7)F2
17.1.24SeidozeriteNa8Mn22+Zr3Ti3(Si2O7)4O4F4
17.1.25ThorosteenstrupineCaMnThSi4O11(OH)F · 6H2O
17.1.26Zircophyllite(K,Na)3(Mn,Fe2+)7(Zr,Ti)2Si8O24(O,OH,F)7
17.1.27JinshajiangiteBaNaFe42+Ti2(Si2O7)2O2(OH)2F
17.1.28Rosenbuschite(Ca,Na)3(Zr,Ti)(Si2O7)OF
17.1.29NarsarsukiteNa4(Ti,Fe)2[Si8O20](O,OH,F)2
17.1.30SonoliteMn92+(SiO4)4(OH,F)2

Other Names for Chondrodite

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.

References for Chondrodite

Reference List:
American Mineralogist (1970): 55: 1182-1194.

Sinogeikin, S.V. and Bass, J.D. (1999) Single-crystal elastic properties of chondrodite: implications for water in the upper mantle. Physics and Chemistry of Minerals: 26: 297-303.

Langer, K., Platonov, A.N., Matsyuk, S.S., and Wildner, M. (2002) The crystal chemistry of the humite minerals Fe 2+ - Ti 4+ charge transfer and structural allocation of Ti 4+ in chondrodite and clinohumite. European Journal of Mineralogy: 14: 1027-1032.

Internet Links for Chondrodite

Specimens:
The following Chondrodite specimens are currently listed for sale on minfind.com.

Localities for Chondrodite

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.
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