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Chondrodite

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Formula:
(Mg,Fe
2+
 
)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
System:MonoclinicColour:Yellow, Red or Brown.
Lustre:Vitreous, ResinousHardness:6 - 6½
Member of:Humite Group
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:Ribbeite
Isostructural with:Alleghanyite, Chegemite, Edgrewite, Hydroxylchondrodite, Hydroxylclinohumite, Kumtyubeite, Manganhumite, Norbergite, Reinhardbraunsite, Sonolite


May be confused with clinohumite.

Visit gemdat.org for gemological information about Chondrodite. Currently in public beta-test.

Classification of Chondrodite

IMA status:Valid - first described prior to 1959 (pre-IMA) - "Grandfathered"
Strunz 8th edition ID:8/B.04-20
Nickel-Strunz 10th (pending) edition ID:9.AF.45

9 : SILICATES (Germanates)
A : Nesosilicates
F : Nesosilicates with additional anions; cations in [4], [5] and/or only [6] coordination
Dana 8th edition ID: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
Hey's CIM Ref.:17.1.10

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

Type Locality:Skräbböle quarry, Pargas (Parainen), Southwestern Finland Region, Finland
Year of Discovery:1817

Occurrences of Chondrodite

Geological Setting:In contact metamorphic rocks, carbonatites

Physical Properties of Chondrodite

Lustre: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 (measured):3.16 - 3.26 g/cm3
Density (calculated):3.177 g/cm3

Crystallography of Chondrodite

Crystal System:Monoclinic
Class (H-M):2/m - Prismatic
Space Group:P21/b {P1 1 21/b} {P21/c} {P1 21/c 1} {P21/a}
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}
Crystal Atlas:
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Chondrodite no.11 - Goldschmidt (1913-1926)
Chondrodite no.12 - Goldschmidt (1913-1926)

About Crystal Atlas

The mindat.org Crystal Atlas allows you to view a selection of crystal drawings of real and idealised crystal forms for this mineral and, in certain cases, 3d rotating crystal objects. The 3d models and HTML5 code are kindly provided by www.smorf.nl.

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Edge Lines | Miller Indicies | Axes

Transparency
Opaque | Translucent | Transparent

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Along a-axis | Along b-axis | Along c-axis | Start rotation | Stop rotation
X-Ray Powder Diffraction:
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Radiation - Copper Kα
Data Set:
Horizontal Axis: ° to ° Vertical Axis: % Source Data: Filtered Data:
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°
Maximum Birefringence:δ = 0.027 - 0.032

Chart 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,Fe
2+
 
)
 
5
(SiO
 
4
)
 
2
(F,OH)
 
2
Simplified for copy/paste:(Mg,Fe2+)5(SiO4)2(F,OH)2
Idealised Formula:
Mg
 
5
(SiO
 
4
)
 
2
F,
 
2
Essential elements:F, Mg, O, Si
All elements listed in formula:F, Fe, H, Mg, O, Si
Common Impurities:Ti,Al,Mn

Relationship of Chondrodite to other Species

Member of:Humite Group
Other Members of Group:

- +
Alleghanyite
Mn
2+
5
(SiO
 
4
)
 
2
(OH)
 
2
Chegemite
Ca
 
7
(SiO
 
4
)
 
3
(OH)
 
2
Clinohumite
Mg
 
9
(SiO
 
4
)
 
4
F
 
2
Edgrewite
Ca
 
9
(SiO
 
4
)
 
4
F
 
2
Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
Hydroxylchondrodite
Mg
 
5
(SiO
 
4
)
 
2
(OH)
 
2
Hydroxylclinohumite
Mg
 
9
(SiO
 
4
)
 
4
(OH)
 
2
Jerrygibbsite
Mn
2+
9
(SiO
 
4
)
 
4
(OH)
 
2
Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
Leucophoenicite
Mn
2+
7
(SiO
 
4
)
 
3
(OH)
 
2
Maclureite (Seybert; Nuttall)
Manganhumite
(Mn
2+
 
,Mg)
 
7
(SiO
 
4
)
 
3
(OH)
 
2
Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
Reinhardbraunsite
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
Ribbeite
(Mn
2+
 
,Mg)
 
5
(SiO
 
4
)
 
2
(OH)
 
2
Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2
Unnamed (Ca-analogue of Humite)
Ca
 
7
(SiO
 
4
)
 
4
F
 
2
Unnamed (F-analogue of Chegemite)
Ca
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
Related Minerals - Nickel-Strunz Grouping):

- +
9.AF.05Sillimanite
Al
 
2
(SiO
 
4
)O
9.AF.10Andalusite
Al
 
2
(SiO
 
4
)O
9.AF.10Kanonaite
Mn
3+
 
Al(SiO
 
4
)O
9.AF.15Kyanite
Al
 
2
(SiO
 
4
)O
9.AF.20Mullite
Al
 
4+2x
Si
 
2-2x
O
 
10-x
9.AF.20Krieselite
(Al,Ga)
 
2
(GeO
 
4
)(OH)
 
2
9.AF.23Boromullite
Al
 
9
BSi
 
2
O
 
19
9.AF.25Yoderite
Mg(Al,Fe
3+
 
)
 
3
(SiO
 
4
)
 
2
O(OH)
9.AF.30Magnesiostaurolite
(Mg,Li,Fe
2+
 
)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH)
 
2
9.AF.30Staurolite
(Fe
2+
 
,Mg,Zn)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH,O)
 
2
9.AF.30Zincostaurolite
(Zn,Li,Fe
2+
 
,Mg)
 
1.5-2
Al
 
9
(SiO
 
4
)
 
4
O
 
6
(OH)
 
2
9.AF.35Topaz
Al
 
2
(SiO
 
4
)(F,OH)
 
2
9.AF.40Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
9.AF.45Alleghanyite
Mn
2+
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.45Reinhardbraunsite
Ca
 
5
(SiO
 
4
)
 
2
(OH,F)
 
2
9.AF.45Kumtyubeite
Ca
 
5
(SiO
 
4
)
 
2
F
 
2
9.AF.45Hydroxylchondrodite
Mg
 
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.50Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
9.AF.50Manganhumite
(Mn
2+
 
,Mg)
 
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.50Unnamed (Ca-analogue of Humite)
Ca
 
7
(SiO
 
4
)
 
4
F
 
2
9.AF.55Clinohumite
Mg
 
9
(SiO
 
4
)
 
4
F
 
2
9.AF.55Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2
9.AF.55Hydroxylclinohumite
Mg
 
9
(SiO
 
4
)
 
4
(OH)
 
2
9.AF.60Leucophoenicite
Mn
2+
7
(SiO
 
4
)
 
3
(OH)
 
2
9.AF.65Ribbeite
(Mn
2+
 
,Mg)
 
5
(SiO
 
4
)
 
2
(OH)
 
2
9.AF.70Jerrygibbsite
Mn
2+
9
(SiO
 
4
)
 
4
(OH)
 
2
9.AF.75Franciscanite
Mn
2+
6
(V
5+
 
,☐)
 
2
(SiO
 
4
)
 
2
(O,OH)
 
6
9.AF.75Örebroite
Mn
2+
3
(Sb
5+
 
,Fe
3+
 
)(SiO
 
4
)(O,OH)
 
3
9.AF.75Welinite
Mn
2+
6
(W
6+
 
,Mg)
 
2
(SiO
 
4
)
 
2
(O,OH)
 
6
9.AF.80Ellenbergerite
Mg
 
6
(Mg,Ti,Zr,◻)
 
2
(Al,Mg)
 
6
Si
 
8
O
 
28
(OH)
 
10
9.AF.85Chloritoid
(Fe
2+
 
,Mg,Mn
2+
 
)Al
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.85Magnesiochloritoid
MgAl
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.85Ottrélite
(Mn
2+
 
,Fe
2+
 
,Mg)Al
 
2
(SiO
 
4
)O(OH)
 
2
9.AF.90Poldervaartite
CaCa[SiO
 
3
(OH)](OH)
9.AF.90Olmiite
CaMn
2+
 
[SiO
 
3
(OH)](OH)
Related Minerals - Hey's Index Grouping:

- +
17.1.1Hectorite
Na
 
0.3
(Mg,Li)
 
3
(Si
 
4
O
 
10
)(F,OH)
 
2
17.1.3Agrellite
NaCa
 
2
Si
 
4
O
 
10
F
17.1.4Fluorapophyllite-(Na)
NaCa
 
4
(Si
 
8
O
 
20
)F · 8H
 
2
O
17.1.5Fluorapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(F,OH) · 8H
 
2
O
17.1.6Hydroxyapophyllite-(K)
KCa
 
4
(Si
 
8
O
 
20
)(OH,F) · 8H
 
2
O
17.1.7Hsianghualite
Ca
 
3
Li
 
2
(Be
 
3
Si
 
3
O
 
12
)F
 
2
17.1.8Leucophanite
NaCaBeSi
 
2
O
 
6
F
17.1.9Norbergite
Mg
 
3
(SiO
 
4
)(F,OH)
 
2
17.1.11Humite
(Mg,Fe
2+
 
)
 
7
(SiO
 
4
)
 
3
(F,OH)
 
2
17.1.12Clinohumite
Mg
 
9
(SiO
 
4
)
 
4
F
 
2
17.1.13Canasite
K
 
2
Na
 
4
Ca
 
5
(Si
 
12
O
 
30
(OH,F)
 
4
17.1.14Charoite
(K,Sr)
 
15-16
(Ca,Na)
 
32
[Si
 
6
O
 
11
(O,OH)
 
6
]
 
2
[Si
 
12
O
 
18
(O,OH)
 
12
]
 
2
[Si
 
17
O
 
25
(O,OH)
 
18
]
 
2
(OH,F)
 
4
· ~3H
 
2
O
17.1.15Cuspidine
Ca
 
4
(Si
 
2
O
 
7
)(F,OH)
 
2
17.1.16Bultfonteinite
Ca
 
2
(HSiO
 
4
)F · H
 
2
O
17.1.17Zeophyllite
Ca
 
13
(Si
 
10
O
 
28
)F
 
10
· 6H
 
2
O
17.1.18Rowlandite-(Y)
(Y,Ce)
 
4
Fe
2+
 
(Si
 
2
O
 
7
)
 
2
F
 
2
(?)
17.1.19Yuksporite
(K,Ba)NaCa
 
2
(Si,Ti)
 
4
O
 
11
(F,OH) · H
 
2
O
17.1.20Yftisite-(Y)
(Y,Dy,Er)
 
4
(Ti,Sn)(SiO
 
4
)
 
2
O(F,OH)
 
6
17.1.21Mosandrite
(◻,Ca,Na)
 
3
(Ca,REE)
 
4
Ti(Si
 
2
O
 
7
)
 
2
[H
 
2
O,OH,F]
 
4
· H
 
2
O
17.1.22Hiortdahlite
(Ca,Na)
 
3
(Zr,Ti)(Si
 
2
O
 
7
)(O,OH,F)
 
2
17.1.23Burpalite
Na
 
2
CaZr(Si
 
2
O
 
7
)F
 
2
17.1.24Seidozerite
Na
 
8
Mn
2+
2
Zr
 
3
Ti
 
3
(Si
 
2
O
 
7
)
 
4
O
 
4
F
 
4
17.1.25Thorosteenstrupine
CaMnThSi
 
4
O
 
11
(OH)F · 6H
 
2
O
17.1.26Zircophyllite
(K,Na)
 
3
(Mn,Fe
2+
 
)
 
7
(Zr,Ti)
 
2
Si
 
8
O
 
24
(O,OH,F)
 
7
17.1.27Jinshajiangite
BaNaFe
2+
4
Ti
 
2
(Si
 
2
O
 
7
)
 
2
O
 
2
(OH)
 
2
F
17.1.28Rosenbuschite
(Ca,Na)
 
3
(Zr,Ti)(Si
 
2
O
 
7
)OF
17.1.29Narsarsukite
Na
 
4
(Ti,Fe)
 
2
[Si
 
8
O
 
20
](O,OH,F)
 
2
17.1.30Sonolite
Mn
2+
9
(SiO
 
4
)
 
4
(OH,F)
 
2

Other Names for Chondrodite

Synonyms:
BrocchiteBrucite (of Gibbs)CondroditeProlectite
Other Languages:
German:Brocchit
Chondrodit
Condrodit
Prolectit
Russian:Хондродит
Simplified Chinese:粒硅镁石
Spanish:Brocchita
Chondrodita
Condrodita
Prolectita

Other Information

Health Warning: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.

Best Localities for Chondrodite

Best of Species:Chondrodite

Internet Links for Chondrodite

Search Engines:
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  • External Links:
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  • Look for Chondrodite on Wikipedia
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  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Chondrodite details from Handbook of Mineralogy (PDF)
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  • Specimens:The following Chondrodite specimens are currently listed for sale on minfind.com.

    Localities for Chondrodite

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