Description: Explore the unique beauty of the natural Labradorite rough mineral specimen, sourced from the Saddleback Mountain, East Kramer Borate area (easter Kramer Colemanite area), East Kramer Mining District, San Bernardino County, Mojave Desert, California. This one-of-a-kind piece is perfect for collectors and enthusiasts alike, thanks to its natural shape, beauty, and characteristic optical properties. Labradorite ((Ca, Na)(Al, Si)4O8) is a calcium-enriched feldspar mineral first identified in Labrador, Canada, which can display an iridescent effect (schiller). Labradorite. Labradorite in a polished rock slab. Labradorite can display an iridescent optical effect (or schiller) known as labradorescence. The cause of this optical phenomenon is lamellar structure caused by an exsolution process due to a miscibility gap. The effect is visible when the lamellar separation is between 128 and 252 nm. The lamellar separation only occurs in plagioclases of a certain composition, in particular, those of calcic labradorite and bytownite (anorthite content of ~60 to 90%). Another requirement for the lamellar separation is very slow cooling of the rock that contains the plagioclase. Slow cooling is required to allow the Ca, Na, Si, and Al ions to diffuse through the plagioclase and produce the lamellar separation. Thus, not all labradorites exhibit labradorescence (they might not have the correct composition and/or they cooled too quickly). Also, not all plagioclases that exhibit labradorescence are labradorites (they may be bytownite). The lamellar separation only occurs in plagioclases of a certain composition, in particular, those of calcic labradorite and bytownite (anorthite content of ~60 to 90%). Another requirement for the lamellar separation is very slow cooling of the rock that contains the plagioclase. Slow cooling is required to allow the Ca, Na, Si, and Al ions to diffuse through the plagioclase and produce the lamellar separation. Thus, not all labradorites exhibit labradorescence (they might not have the correct composition and/or they cooled too quickly). Also, not all plagioclases that exhibit labradorescence are labradorites (they may be bytownite).
Price: 54.95 USD
Location: Canyon Country, California
End Time: 2024-11-30T22:57:02.000Z
Shipping Cost: 0 USD
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Item Specifics
Restocking Fee: No
Return shipping will be paid by: Buyer
All returns accepted: Returns Accepted
Item must be returned within: 30 Days
Refund will be given as: Money Back
Shape: Natural
Country/Region of Manufacture: United States
