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Gregoryite & Nyerereite

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RMM549175

Gregoryite & Nyerereite

Type Locality

Description Tabs

Description
Locality: 
Ol Doinyo Lengai, Ngorongoro District, Arusha Region, Tanzania (United Republic)
Class: 
Massive/Crystalline
Size Range: 
Thumbnail (1-3cm)
Size: 
2.2 × 2 × 1.5 cm
Description

This is a sample of lava from the the world's only active carbonatite volcano. It contains, in micro crystals, two type locality minerals: gregoryite as minute, imperfect, rounded crystals, and flat, tabular crystals of nyerereite.

The material was collected by Bruno Hermier.

The specimen has been treated with lacquer to prevent hydration.

Mineral Data
What's on the rock

Gregoryite

Formula: 
(Na2,K2,Ca)CO3
Strunz: 
5.AA.10
Crystal System: 
Hexagonal
Hardness: 
0.0
Type Locality: 
Mt Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania

Nyerereite

Formula: 
Na2Ca(CO3)2
Strunz: 
5.AC.10
Hardness: 
0.0
Type Locality: 
Mt Oldoinyo Lengai (Ol Doinyo Lengai), Arusha Region, Tanzania

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