Mineralpedia Details for Labuntsovite-Mn

The original Labuntsovite of the Labuntsovite Group, and now designated at the manganese dominant analogue of Labuntsovite, this mineral was named for Russian mineralogists Aleksander Labuntsov and Ekaterina Labuntsov-Kostyleva. Found in several Russia localities including in the co-type localities at the Yum’egor Pass in the Khibiny Massif, where it occurs as an alteration product of murmanite in alkaline rocks, and at Kuftn’yun Mountain in the Lovozero massif. Additional localities include at Magnet Cove in Arkansas, USA, and as crystals in cavities in igneous breccias at Mont Saint-Hilaire in Quebec, Canada. Occurs as orange to brown-orange prismatic crystals and radiating clusters.

Ref. Minerals and their Localities, Bernard, J.H. and Hyršl, J. (2004)

IMA/CNMNC List of Mineral Names (2009) and Handbook of Mineralogy (Anthony et al.), 2 (1995), 444

Formula

Na₄K₄Mn²⁺₂Ti₈O₄(Si₄O₁₂)₄(OH)₄·10-12H₂O 

Crystal System

Monoclinic 

Crystal Habit

Prismatic 

Cleavage

Perfect, None, None 

Luster

Greasy (Oily) 

Color

brownish yellow, pink, reddish brown 

Streak

white 

Class

Monoclinic - Prismatic 

Fracture

Brittle - Subconchoidal 

Hardness

6 

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Orange prismatic Labuntsovite crystals to 1mm in small 6mm vug in matrix.

Orange prismatic and acicular crystals, the largest is 2mm in vuggy igneous breccia

Yellowish, somewhat glassy, short prismatic crystals to 0.75 lining open vug.