London Pegmatite Specimens

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Montebrasite

altering to Scorzalite, Kulanite, Brazilianite & apatite - #DL63096

Details
Data
Provenance
Resources

Locality: Independence pegmatite, White Picacho dist., Yavapai Co., Arizona, United States
Formula: LiAlPO₄(OH)
Availability: Sold
Size: 11 x 7 x 5.5 cm - Cabinet
Tagged: phosphate , pegmatite mineral , lithium

Montebrasite altered to Scorzalite (blue), Kulanite (dark green), and Brazilianite. It is sawed and polished on one side and shows the these alterations along fractures and cleavage plains.

Montebrasite

Formula: LiAlPO₄(OH)
Crystal System: Triclinic
Crystal Habit: Massive - Granular, Prismatic
Cleavage: Perfect, Good, Distinct
Luster: Vitreous - Greasy
Color: bluish, colorless, greenish, greenish gray, gray white
Streak: white
Class: Triclinic - Pinacoidal
Fracture: Brittle - Conchoidal
Hardness: 5.5-6

Collection: Dr. David London Collection

Mineralpedia: View Montebrasite
On Dakota Matrix: Previously Sold Montebrasite
On Dakota Matrix: Other Available Montebrasite
WebMineral: View Montebrasite
Mindat: View Montebrasite

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Montebrasite

altered to Scorzalite & Brazilianite & Kulanite - #DL63819

Details
Data
Provenance
Resources

Locality: Independence mine, White Picacho dist., Yavapai County, Arizona, United States
Formula: LiAlPO₄(OH)
Availability: Sold
Size: 9.5 x 9 x 8 cm - Cabinet
Tagged: phosphate , pegmatite mineral , lithium

The specimen has a sawed and polished side displaying the thin stringers of Scorzalite and the not so obvious Brazilianite and Kulanite. These secondary phosphates formed along cleavages and fractures in the Montebrasite. London published a paper in the American Mineralogist describing the geology and mineralogy of the White Picacho district lihium pegmatites. Click here to view this publication. White Picacho pegmatites have been studied more than any other pegmatites in Arizona. Both London and Jahns wrote numerous papers on these pegmatites.

Montebrasite

Formula: LiAlPO₄(OH)
Crystal System: Triclinic
Crystal Habit: Massive - Granular, Prismatic
Cleavage: Perfect, Good, Distinct
Luster: Vitreous - Greasy
Color: bluish, colorless, greenish, greenish gray, gray white
Streak: white
Class: Triclinic - Pinacoidal
Fracture: Brittle - Conchoidal
Hardness: 5.5-6

Collection: Dr. David London Collection

Mineralpedia: View Montebrasite
On Dakota Matrix: Previously Sold Montebrasite
On Dakota Matrix: Other Available Montebrasite
WebMineral: View Montebrasite
Mindat: View Montebrasite

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Montebrasite

replaced by Scorzalite & Kulanite - #DL63836

Details
Data
Provenance
Resources

Locality: Midnight Owl mine, Yavapai Co., Arizona, United States
Formula: LiAlPO₄(OH)
Availability: Sold
Size: 15 x 12 x 5 cm - Cabinet
Tagged: phosphate , pegmatite mineral , lithium
Special Info: Illustrated in London's book "Pegmatites"

Large specimen, sawed and polished on one side to show the replacement of primary Montebrasite by aluminum phosphates, namely Scorzalite, Kulanite, Crandallite, and Brazilianite. The Scorzalite is the blue and the other phosphates are not readly seen. They were probably identified by EDS or XRD. Montebrasite is an ore of lithium and chiefly a pegmatite mineral. Other primary lithium minerals at the White Picacho district are Spodumene and Lithiophilite.

This specimen is illustrated on page 60 of "Pegmatites".

Montebrasite

Formula: LiAlPO₄(OH)
Crystal System: Triclinic
Crystal Habit: Massive - Granular, Prismatic
Cleavage: Perfect, Good, Distinct
Luster: Vitreous - Greasy
Color: bluish, colorless, greenish, greenish gray, gray white
Streak: white
Class: Triclinic - Pinacoidal
Fracture: Brittle - Conchoidal
Hardness: 5.5-6

Collection: Dr. David London Collection
Special Info: Illustrated in London's book "Pegmatites"

Mineralpedia: View Montebrasite
On Dakota Matrix: Previously Sold Montebrasite
On Dakota Matrix: Other Available Montebrasite
WebMineral: View Montebrasite
Mindat: View Montebrasite

SOLD

Montebrasite

alt. to Scorzalite & Brazilianite & Kulanite - #DL63838

Details
Data
Provenance
Resources

Locality: Independence mine, White Picacho dist., Yavapai County, Arizona, United States
Formula: LiAlPO₄(OH)
Availability: Sold
Size: 14 x 10 x 5 cm - Cabinet
Tagged: pegmatite mineral , lithium

Excellent example of the alteration of white Montebrasite by blue Scorzalite, Brazilianite and Kulanite. Note the outer "skin" of the specimen in the fourth and fifth photos. Montebrasite-Amblygonite typically alters to a brown Kaolinite and the specimen will have smooth rounded edges produced during the alteration process. The name "nodule" is given to the masses of Montebrasite-Amblygonite.