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Crystal Axinite

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Chemical Formula

The inclusive formula for Axinite, encompassing all members, is:
(Ca,Fe,Mg,Mn)3Al2BSi4O15(OH) 

Individual members are:
Axinite-(Fe): Ca2FeAl2BSi4O15(OH) 
Axinite-(Mg): Ca2MgAl2BSi4O15(OH) 
Axinite-(Mn): Ca2MnAl2BSi4O15(OH) 
Tinzenite: (Ca,Mn)2MnAl2BSi4O15(OH) 
 

Composition

Basic aluminum boro-silicate of calcium, iron, magnesium, and manganese 

Color

Smoky brown, dark brown, purplish-brown, greenish-brown, gray, black. Less commonly purple, blue, green, orange, or yellow. Very rarely multicolored. Axinite is strongly dichroic.

Streak

Colorless

Hardness

6.5 - 7

Crystal System

Triclinic

3D Crystal Atlas
(Click for animated model) 

Flattened Tabular

Modified Flattened Tabular

     

Crystal Forms 
and Aggregates

Axinite forms in characteristic, flattened tabular crystals with sharp edges, and in dense groups of such crystals. Also grainy, bladed, columnar, in platy aggregates, in rosettes of sharp crystals, and massive. Crystals are often striated or have parallel line growths.
 

Transparency

Transparent to nearly opaque

Specific Gravity

3.3 - 3.4

Luster

Vitreous

Cleavage

2,1

Fracture

Conchoidal to uneven

Tenacity

Brittle

Other ID Marks

Axinite-(Mn) from Franklin, New Jersey has a red fluorescence.

In Group

Silicates; Cyclosilicates

Striking Features

Color and crystal habits

Environment

In hornfels and other contact metamorphic rocks near granite intrusions, and in granite pegmatites, alpine clefts, and altered diabase.
 

Rock Type

Igneous, Metamorphic

Popularity (1-4)

3

Prevalence (1-3)

2

Demand (1-3)

2

 

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