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Motukoreaite & Calcite

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RSL586643

Motukoreaite & Calcite

Type Locality

Description Tabs

Description
Locality: 
Browns Island, Auckland City, Auckland, North Island, New Zealand
Class: 
Crystals on Matrix
Size Range: 
Thumbnail (1-3cm)
Size: 
2.7 × 2.2 × 1.2 cm
Description

You can see "excellent" prismatic crystals of calcite. Motukoreaite is a fine grained whitish-grey cement, also as globular aggregates, in the altered matrix. Not very nice, but very interesting for systhematic collectors.

Mineral Data
What's on the rock

Calcite

Polymorph of: 
Formula: 
CaCO3
Strunz: 
5.AB.05
Crystal System: 
Trigonal
Hardness: 
3.0
Streak: 
White