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Lustrous Yellow Anglesite Crystal

The Mineral anglesite




Anglesite is a secondary lead mineral that always forms through the alteration of lead sulfides, primarily Galena. Anglesite crystals may contain impurities of Galena, giving a specimen a gray to black color. In some localities, Anglesite forms as a pseudomorph after Galena, giving the crystals a false isometric form.

Gray and black banding is present in some massive Anglesite specimens, which can be seen when a specimen is polished or sliced. Such specimens may even contain unaltered Galena in the center, which did not change over to Anglesite when the outer layers altered. An amber-red Anglesite from Touissit, Morocco, has been synthetically colored by immersing light yellow crystals in bleach.
Chemical Formula PbSO4
Composition Lead sulfate
Color Colorless, white, yellow, brown, green, orange, red, gray. May also be black from Galena impurities, which can also cause it to be banded gray and black. Sometimes multicolored with yellow and white or colorless zoning.
Streak White, but light gray if it has Galena impurities.
Hardness 2.5 - 3
Crystal System Orthorhombic
3D Crystal Atlas
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Crystal Forms
and Aggregates
Most commonly in tabular or prismatic crystals, sometimes elongated. Anglesite crystals often have very distinct pointed terminations.

Crystals may also be bipyramidal, and are frequently striated. Also grainy, crusty, massive, reniform, and stalactitic. Anglesite is unique in that it never forms pseudohexagonal trillings as other members of its group do.

Anglesite is also known to pseudomorph after other minerals, especially Galena and Cerussite, which may give it strange additional shapes and forms.
Transparency Transparent to translucent in thin splinters
Specific Gravity 6.4
Luster Adamantine, resinous
Cleavage 2,1 - basal ; 3,1 - prismatic
Fracture Conchoidal
Tenacity Brittle
Other ID Marks Commonly fluorescent light yellow in shortwave ultraviolet light.
In Group Sulfates; Anhydrous Sulfates
Striking Features Heaviness, adamantine luster, mineral associations, and untwinned crystals.
Environment Anglesite is a secondary mineral forming in weathered lead deposits.
Rock Type Metamorphic
Popularity (1-4) 2
Prevalence (1-3) 3
Demand (1-3) 1


Anglesite AUCTIONS



USES
Anglesite is an ore of lead, although good crystals are preserved when possible, due to the high demand and cost of good specimens.

NOTEWORTHY LOCALITIES
Very large Anglesite crystals were found in Tsumeb, Namibia; and some of the finest gemmy crystals came from both Mibladen and Touissit, Morocco, including the bright golden-yellow type. Other well-known localities are the Monteponi and Montevecchio Mines, Sardinia, Italy; and Broken Hill, New South Wales, Australia. The original locality of Anglesite, after which this mineral is named for, is Parys Mountain, Amlwch, on the Isle of Anglesey in Wales, United Kingdom. Specimens from this mine are very old and exceptionally classic.

Three Mexican occurrences of note are the Ahumada Mine, Sierra de Los Lamentos, Chihuahua; the Santa Eulalia District, Chihuahua; and San Felipe, Aconchi, Sonora.

In the U.S., white crystals associated with Pyromorphite have come from the Wheatley Mines in Phoenixville, Chester Co., Pennsylvania. The area of Joplin, Ottawa Co., Missouri has produced isometric pseudomorphs of Anglesite over Galena, as well as banded Anglesite. This mineral has also come from the Coeur d'Alene District, Kellogg, Shoshone Co., Idaho; the Blanchard Mine, Bingham, Socorro Co., New Mexico; the Mammoth-Saint Anthony Mine, Tiger, Pinal Co., Arizona; and Castle Dome, Yuma Co, Arizona.

COMMON MINERAL ASSOCIATIONS
Galena, Cerussite, Smithsonite, Hemimorphite, Sphalerite, Azurite, Malachite, Sulfur, Pyromorphite, Linarite

DISTINGUISHING SIMILAR MINERALS
Celestine - Lacks adamantine luster, lighter in weight (3.9 - 4.0).
Barite - Lacks adamantine luster.
Cerussite - Effervesces in hydrochloric acid, crystals frequently twinned.
Phosgenite - Very hard to distinguish from Anglesite, but occurs in different crystals, and is sectile and nonbrittle.


anglesite PHOTOS
 
ADDITIONAL RESOURCES
 
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