Mindat Logo
Home Page Log In Messageboard The Mindat Directory
Register Search Pages Mineral Chatroom The Mindat Store

Dorrite

This page is currently not sponsored. Click here to sponsor this page.
Big Photo

Nickenicher Sattel (Eicher Sattel), Eich, Andernach, Eifel, Rhineland-Palatinate, Germany
© C.Boutry

Show Dorrite Photos (2)



Formula:
Ca
 
4
(Mg
 
3
Fe
3+
9
)O
 
4
(Si
 
3
Al
 
8
Fe
3+
 
O
 
36
)
System:TriclinicColour:red-brown, brown-black, ...
Lustre:Sub-MetallicHardness:5½
Member of:Rhönite Group > Sapphirine Supergroup
This page provides mineralogical data about Dorrite.

Classification of Dorrite

IMA status:Approved 1987
Strunz 8th edition ID:8/F.14-40
Nickel-Strunz 10th (pending) edition ID:9.DH.40

9 : SILICATES (Germanates)
D : Inosilicates
H : Inosilicates with 4-periodic single chains, Si4O12
Dana 8th edition ID:69.2.1a.2

69 : INOSILICATES Chains with Side Branches or Loops
2 : Chains with Side Branches or Loops with P>2
Hey's CIM Ref.:16.23.2

16 : Silicates Containing Aluminum and other Metals
23 : Aluminosilicates of Fe, Ca, and Mg
mindat.org URL:http://www.mindat.org/min-1313.html
Please feel free to link to this page.

Type Occurrence of Dorrite

Type Locality:Durham Ranch, Reno Junction, Campbell Co., Wyoming, USA
Year of Discovery:1987

Physical Properties of Dorrite

Lustre:Sub-Metallic
Colour:red-brown, brown-black, dark brown
Streak:brownish grey
Hardness (Mohs):5½
Cleavage:Distinct/Good

Crystallography of Dorrite

Crystal System:Triclinic
Cell Parameters:a = 10.5Å, b = 10.89Å, c = 9.91Å
α = 106.26°, β = 95.16°, γ = 124.75°
Ratio:a:b:c = 0.964 : 1 : 0.91
Unit Cell Volume:V 847.91 ų (Calculated from Unit Cell)

Optical Data of Dorrite

Type:Biaxial (-)
RI values: nα = 1.820 nβ = 1.840 nγ = 1.860
2V:Measured: 90° , Calculated: 88°
Maximum Birefringence:δ = 0.040

Chart shows birefringence interference colour range (at 30µm thickness) and does not take into account mineral colouration.
Surface Relief:Very High
Dispersion:small

Chemical Properties of Dorrite

Formula:
Ca
 
4
(Mg
 
3
Fe
3+
9
)O
 
4
(Si
 
3
Al
 
8
Fe
3+
 
O
 
36
)
Essential elements:Al, Ca, Fe, Mg, O, Si
All elements listed in formula:Al, Ca, Fe, Mg, O, Si
Common Impurities:Ti,Cr,Mn,Na,K

Relationship of Dorrite to other Species

Member of:Rhönite Group > Sapphirine Supergroup
Other Members of Group:

- +
Høgtuvaite
(Ca,Na)
 
2
(Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|Be(Si,Al)
 
5
O
 
18
]
Leucorhönite
Ca
 
2
(Mg,Fe
3+
 
,Al)
 
6
(Si,Al)
 
6
O
 
20
Makarochkinite
Ca
 
2
Fe
2+
4
Fe
3+
 
Ti[O
 
2
|BeAlSi
 
4
O
 
18
]
Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
Serendibite
(Ca,Na)
 
2
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
3
[O
 
2
|(Si,Al,B)
 
6
O
 
18
]
Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
Related Minerals - Nickel-Strunz Grouping):

- +
9.DH.05Leucophanite
NaCaBeSi
 
2
O
 
6
F
9.DH.10Ohmilite
Sr
 
3
(Ti,Fe
3+
 
)(Si
 
4
O
 
12
)(O,OH) · 2-3H
 
2
O
9.DH.15Haradaite
SrVSi
 
2
O
 
7
9.DH.15Suzukiite
BaVSi
 
2
O
 
7
9.DH.20Batisite
BaNaNaTi
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.20Shcherbakovite
(K,Ba)KNa(Ti,Nb)
 
2
(Si
 
4
O
 
12
)O
 
2
9.DH.25Taikanite
Sr
 
3
BaMn
2+
2
(Si
 
4
O
 
12
)O
 
2
9.DH.30Krauskopfite
BaSi
 
2
O
 
5
 · 3H
 
2
O
9.DH.35Balangeroite
(Mg,Fe
2+
 
,Fe
3+
 
,Mn
2+
 
)
 
42
Si
 
16
O
 
54
(OH)
 
40
9.DH.35Gageite
Mn
 
21
O
 
3
(Si
 
4
O
 
12
)
 
2
(OH)
 
20
9.DH.40Aenigmatite
Na
 
2
Fe
2+
5
Ti(Si
 
6
O
 
18
)O
 
2
9.DH.40Høgtuvaite
(Ca,Na)
 
2
(Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|Be(Si,Al)
 
5
O
 
18
]
9.DH.40Krinovite
Na
 
2
Mg
 
4
Cr
3+
2
(Si
 
6
O
 
18
)O
 
2
9.DH.40Makarochkinite
Ca
 
2
Fe
2+
4
Fe
3+
 
Ti[O
 
2
|BeAlSi
 
4
O
 
18
]
9.DH.40Rhönite
Ca
 
2
(Mg,Fe
2+
 
,Fe
3+
 
,Ti)
 
6
[O
 
2
|(Si,Al)
 
6
O
 
18
]
9.DH.40Serendibite
(Ca,Na)
 
2
(Mg,Fe
2+
 
)
 
3
(Al,Fe
3+
 
)
 
3
[O
 
2
|(Si,Al,B)
 
6
O
 
18
]
9.DH.40Welshite
Ca
 
4
Mg
 
9
Sb
 
3
O
 
4
[Si
 
6
Be
 
3
AlFe
 
2
O
 
36
]
9.DH.40Wilkinsonite
Na
 
2
Fe
2+
4
Fe
3+
2
(Si
 
6
O
 
18
)O
 
2
9.DH.45Sapphirine
(Mg,Fe)
 
4-x
Al
 
4+x
[Al
 
4+x
Si
 
2-x
O
 
18
]O
 
2
9.DH.50Khmaralite
(Mg,Al,Fe)
 
16
[(Al,Si,Be)
 
12
O
 
36
]O
 
4
9.DH.55Surinamite
(Mg,Fe)
 
3
Al
 
4
BeSi
 
3
O
 
16
9.DH.60Deerite
(Fe,Mn)
 
6
(Fe,Al)
 
3
[Si
 
6
O
 
17
]O
 
3
(OH)
 
5
9.DH.65Howieite
Na(Fe,Mn)
 
10
(Fe,Al)
 
2
Si
 
12
O
 
31
(OH)
 
13
9.DH.65Taneyamalite
(Na,Ca)(Mn,Mg,Fe)
 
12
Si
 
12
(O,OH)
 
44
9.DH.70Johninnesite
Na
 
2
Mn
2+
9
Mg
 
7
(OH)
 
8
[AsO
 
4
]
 
2
[Si
 
6
O
 
17
]
 
2
9.DH.75Agrellite
NaCa
 
2
Si
 
4
O
 
10
F
Related Minerals - Hey's Index Grouping:

- +
16.23.1Augite
(Ca,Na)(Mg,Fe
2+
 
,Al,Fe
3+
 
,Ti)[(Si,Al)
 
2
O
 
6
]
16.23.3Vesuvianite
(Ca,Na,☐)
 
19
(Al,Mg,Fe
3+
 
)
 
13
(☐,B,Al,Fe
3+
 
)
 
5
(Si
 
2
O
 
7
)
 
4
(SiO
 
4
)
 
10
(OH,F,O)
 
10
16.23.5Ferro-hornblende
☐{Ca
 
2
}{Fe
2+
4
Al}(AlSi
 
7
O
 
22
)(OH)
 
2
16.23.6Magnesio-hornblende
☐{Ca
 
2
}{Mg
 
4
Al}(AlSi
 
7
O
 
22
)(OH)
 
2
16.23.7Aerinite
(Ca
 
5.1
Na
 
0.5
)(Fe
3+
 
,Al,Fe
2+
 
,Mg)
 
4
(Al,Mg)
 
6
[HSi
 
12
O
 
36
(OH)
 
12
][(CO
 
3
)
 
1.2
(H
 
2
O)
 
12
]

Other Names for Dorrite

Synonyms:
IMA1987-054
Other Languages:
German:Dorrit
Spanish:Dorrita

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 Dorrite

Reference List:

- +
American Mineralogist: 73: 1440-1448.

Internet Links for Dorrite

Search Engines:
  • Look for Dorrite on Google
  • Look for Dorrite images on Google
    • External Links:
  • Look for Dorrite on Webmineral
  • Look for Dorrite on Athena Mineralogy
  • Look for Dorrite on Mineralien Atlas
  • Raman and XRD data at RRUFF project
  • American Mineralogist Crystal Structure Database
  • Dorrite details from Handbook of Mineralogy (PDF)
    • Mineral Dealers:
  • webminerals
  • Buy fine minerals and gemstones from Pala International
  • Find Dorrite on www.crystalclassics.co.uk
  • Fine Minerals from Weinrich Minerals, Inc.
  • Buy RARE Minerals from Rocks of Africa
  • Fine and rare minerals from mintreasure.com
  • Wilensky Fine Minerals
  • Top quality minerals from Kristalle of California
  • Mineral Classics - Worldwide Collector Quality Minerals and Gems
  • Search for Dorrite on Well-Arranged Molecules
  • Buy minerals from YourMineralCollection
  • Search for minerals at Heliodor
    • Jobs:
  • Mining & Geology Jobs

    • Localities for Dorrite

    The 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.
    Hide Locality List
    (TL) indicates type locality. ? indicates mineral may be doubtful at this locality. All other localities listed without reference should be considered as uncertain and unproven until references can be found.
    Germany
     
    • Rhineland-Palatinate
      • Eifel
        • Andernach
          • Eich
    		Kunzmann, T. (1999): The aenigmatite-rhönite mineral group. Eur. J. Mineral., 11, 743-756
    Russia
     
    • Urals Region
      • Southern Urals
        • Chelyabinsk Oblast'
    		Cesnokov, B., Kotrly, M. and Nisanbajev, T. (1998): Brennende Abraumhalden und Aufschlüsse im Tscheljabinsker Kohlenbecken - eine reiche Mineralienküche. Mineralien-Welt, 9 (3), 54-63 (in German).
    USA
     
    • Wyoming
      • Campbell Co.
        • Reno Junction
    		Amer.Min.(1988) 73, 1440-1448
      • Johnson Co.
        • Buffalo
    		American Mineralogist, Volume 73, pages 1440-1448, 1988
    Mineral and/or Locality
    Search Google
     
    Copyright © Jolyon Ralph and Ida Chau 1993-2013. Site Map. Locality, mineral & photograph data are the copyright of the individuals who submitted them. Site hosted & developed by Jolyon Ralph. Mindat.org is an online information resource dedicated to providing free mineralogical information to all. Mindat relies on the contributions of thousands of members and supporters. Mindat does not offer minerals for sale. If you would like to add information to improve the quality of our database, then click here to register.
    Current server date and time: 14th May 2013 10:37:13
    Mineral and Locality Search
    Mineral:
    and/or Locality:
    Options
    Fade toolbar when not in focusFix toolbar to bottom of page
    Hide Social Media Links
    Slideshow frame delay seconds