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Laachite

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About LaachiteHide

Formula:
(Ca,Mn)2Zr2Nb2TiFeO14
Colour:
brownish-red
Lustre:
Adamantine
Specific Gravity:
5.417 (Calculated)
Crystal System:
Monoclinic
Name:
For the type locality
Monoclinic analogue of zirconolite-3O with Nb dominant over Ti.


Classification of LaachiteHide

Approved
Approval Year:
2013

Physical Properties of LaachiteHide

Adamantine
Transparency:
Translucent
Colour:
brownish-red
Streak:
brownish-red
Density:
5.417 g/cm3 (Calculated)

Chemical Properties of LaachiteHide

Formula:
(Ca,Mn)2Zr2Nb2TiFeO14

Crystallography of LaachiteHide

Crystal System:
Monoclinic
Class (H-M):
2/m - Prismatic
Space Group:
B2/b
Setting:
C2/c
Cell Parameters:
a = 7.3119(5) Å, b = 14.179(1) Å, c = 10.1700(7) Å
γ = 90.072(2)°
Ratio:
a:b:c = 0.516 : 1 : 0.717

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Unit Cell V:
0.00 ų (Calculated from Unit Cell)
Z:
4
Twinning:
twinned

X-Ray Powder DiffractionHide

Powder Diffraction Data:
d-spacingIntensity
4.298(22)
2.967(100)
2.901(59)
2.551(32)
1.800(34)
1.541(24)
1.535(23)
1.529(23)
Comments:
From Type Description.

Type Occurrence of LaachiteHide

General Appearance of Type Material:
long-prismatic crystals up to 0.02 × 0.04 × 0.5 mm, which are present as random intergrowths and twins in cavities within sanidinite.
Place of Conservation of Type Material:
Type material is deposited in the collections of the Fersman Mineralogical Museum of the Russian Academy of Sciences, Moscow, Russia, registration number 4361/1
Geological Setting of Type Material:
Ejectum, Nosean-bearing syenite
Associated Minerals at Type Locality:

Synonyms of LaachiteHide

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 LaachiteHide

Reference List:
Sort by Year (asc) | by Year (desc) | by Author (A-Z) | by Author (Z-A)
Chukanov, N.V., Krivovichev, S.V., Pakhomova, A.S., Pekov, I.V., Schäfer, C., Vigasina, M.F. and Van, K.V. (2013) Laachite, IMA 2012-100. CNMNC Newsletter No. 16, 2013, page 2700; Mineralogical Magazine, 77, 2695-2709
Schäfer, Ch., Chukanov, N. (2014): Über den Laachit, ein neues, mit Zirkonolith verwandtes Mineral vom Laacher Vulkan. Der Aufschluss, 65 (4), 228-239.
Chukanov, N. V., Krivovichev, S. V., Pakhomova, A. S., Pekov, I. V., Schäfer, C., Vigasina, M. F., & Van, K. V. (2014). Laachite,(Ca, Mn) 2Zr2Nb2TiFeO14, a new zirconolite-related mineral from the Eifel volcanic region, Germany. European Journal of Mineralogy, 26(1), 103-111.

Internet Links for LaachiteHide

Localities for LaachiteHide

ⓘ - 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.
Germany (TL)
 
  • Rhineland-Palatinate
    • Mayen-Koblenz
      • Mendig
        • Niedermendig
- + [Chukanov, N.V., Krivovichev, S.V., Pakhomova, A.S., Pekov, I.V., Schäfer, C., Vigasina, M.F. and Van, K.V. (2013) Laachite, IMA 2012-100. CNMNC Newsletter No. 16, 2013, page 2700; Mineralogical Magazine, 77, 2695-2709], [Schäfer, Ch., Chukanov, N. (2014): Über den Laachit, ein neues, mit Zirkonolith verwandtes Mineral vom Laacher Vulkan, Der Aufschluss, Vol. 65 (4), 228-239]
Mineral and/or Locality  
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