Amphibole
(Hornblende)

NORWAY
Hornblende
Single Crystal

Ontario
Canada
Hornblende
Cleavage Surfaces

Phillips Mine
New York
Diagnostic Features

1. Hardness: 5,5
2. Streak: Greenish white to none
3. Luster: Nonmetallic
4. Specific Gravity: 3.1
5. Cleavage: 2 lengthwise directions at 56 and 124 degrees
6. Fracture: None
7. Other: Commonly dark green to brownish green. Cleaves into lengthwise, prismatic crystals.
Identification Tips

Amphiboles and pyroxenes are often mistaken for one another  due to their generally similar appearance ad color. However, there are important distinguishing characteristics by which the two may be distinguished.
1. Amphibole has strongly oblique cleavage whereas pyroxene possesses orthogonal cleavage.
2. Amphiboles are more common in felsic igneous rocks whereas pyroxenes are ubiquitous to mafic and ultramafic igneous rocks.
3. Amphiboles are common in metamorphic rocks whereas pyroxenes are rare in such rocks.
4. Amphiboles tend to cleave into splintery fragments when struck, whereas pyroxenes do not.
Hornblende (Amphibole) Cleavage
[Intergrown Crystals]

Bancroft

CANADA
Photographed by Michael P. Klimetz
Photographed by Michael P. Klimetz


[Crystals in Albite with Garnet]

Gertrusk auf der Saualpe

Carinthia
AUSTRIA
Photographed by Michael P. Klimetz


[Crystals in Albite with Garnet]

Gertrusk auf der Saualpe

Carinthia
AUSTRIA
Photographed by Michael P. Klimetz


[Crystals in Albite with Garnet]

Gertrusk auf der Saualpe

Carinthia
AUSTRIA
Photographed by Michael P. Klimetz


[Crystals in Albite with Garnet]

Gertrusk auf der Saualpe

Carinthia
AUSTRIA
Photographed by Michael P. Klimetz


Magnesio-Hastingsite
[Terminated Crystal]

Rhein Property
Amity

Orange County
NEW YORK
Photographed by Michael P. Klimetz


Magnesio-Hastingsite
[Terminated Crystal]

Rhein Property
Amity

Orange County
NEW YORK
Photographed by Michael P. Klimetz


Magnesio-Hastingsite
[Terminated Crystal]

Rhein Property
Amity

Orange County
NEW YORK
Photographed by Michael P. Klimetz


Magnesio-Hastingsite
[Crystal with Calcite]

Rhein Property
Amity

Orange County
NEW YORK
Photographed by Michael P. Klimetz


Magnesio-Hastingsite
[Crystal with Calcite]

Rhein Property
Amity

Orange County
NEW YORK
Photographed by Michael P. Klimetz

[Intergrown Crystals with Feldspar]

Wilberforce

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals with Feldspar]

Wilberforce

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals with Feldspar]

Wilberforce

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals with Feldspar]

Wilberforce

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals with Feldspar]

Wilberforce

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals with Feldspar]

Wilberforce

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals with Magnetite]

Tilly Foster Mine

Putnam County
NEW YORK
Photographed by Michael P. Klimetz

[Intergrown Crystals with Magnetite]

Tilly Foster Mine

Putnam County
NEW YORK
Photographed by Michael P. Klimetz

[Intergrown Crystals with Magnetite]

Tilly Foster Mine

Putnam County
NEW YORK
Photographed by Michael P. Klimetz

[Intergrown Crystals with Magnetite]

Tilly Foster Mine

Putnam County
NEW YORK
Photographed by Michael P. Klimetz

[Intergrown Crystals]

Turner Island

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals]

Turner Island

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals]

Turner Island

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals]

Turner Island

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals]

Turner Island

Ontario
CANADA
Photographed by Michael P. Klimetz

[Intergrown Crystals]

Turner Island

Ontario
CANADA