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Brochantite Cyanotrichite Azurite & Philipsbornite On Malachite

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CLB542219

Brochantite Cyanotrichite Azurite & Philipsbornite On Malachite

Classic Locality

Description Tabs

Description
Locality: 
Grand View Mine, Grand Canyon, Coconino County, Arizona, United States of America
Class: 
Combination
Size Range: 
Small cabinet (7-10 cm)
Size: 
9 × 6 × 2 cm
Description

The Grand View mine is a long forgotten locality, closed for production in 1916. Last owner was William Randolph Hearst. Now it's a nature reserve for rare bats. The mineralization is secondary copper minerals. 

Dark green brochantite crystals on malachite with light blue, acicular cyanotrichite and dark blue azurite crystals. In one corner yellow-orange philipsbornite.

The problem with the locality is, there are many different similar copper minerals. The light blue species could be also carbonatecyanotrichite, parnauite or chalcoalumite and there is also dark blue osarizawaite. Detailed analysis might bring up some surprises.

Some waterclear gypsum on top.

Comes with an old, stamped 'Grand Canyon' label.

 

Mineral Data
What's on the rock

Brochantite

Formula: 
Cu4(SO4)(OH)6
Strunz: 
7.BB.25
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0
Type Locality: 
Mednorudyanskoye Cu Deposit, Nizhnii Tagil, Sverdlovskaya Oblast', Middle Urals, Urals Region, Russia...

Cyanotrichite

Formula: 
Cu4Al2(SO4)(OH)12·2H2O
Strunz: 
7.DE.10
Crystal System: 
Orthorhombic
Hardness: 
1.0 - 3.0
Type Locality: 
Moldova Nouă (Neumoldowa), Moldova Nouă-Sasca Cu-Mo ore field, Banat Mts, Caraş-Severin Co., Romania

Azurite

Formula: 
Cu3(CO3)2(OH)2
Strunz: 
5.BA.05
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0
Type Locality: 
Chessy copper mines, Chessy-les-Mines, Le Bois d'Oingt, Rhône, Rhône-Alpes, France...

Philipsbornite

Formula: 
PbAl3(AsO4)2(OH)5·H2O
Strunz: 
8.BL.10
Crystal System: 
trigonal
Hardness: 
4.5
Type Locality: 
Red Lead Mine, Dundas mineral field, Zeehan district, Tasmania, Australia

Malachite

Formula: 
Cu2(CO3)(OH)2
Strunz: 
5.BA.10
Crystal System: 
Monoclinic
Hardness: 
3.5 - 4.0

Seller Information

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