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Quartz, var. Amethyst

Quartz, var. Amethyst

Specimen # 102309
Mineral: Quartz, var. Amethyst
Location: Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia
Size: 6.2 x 4.0 x 2.8 cm
Price: $45.00 CAD

Quantity:

Detailed Description

Clustered intergrown lilac amethyst balls with nice form and lustre. In excellent condition, a couple of incomplete balls at either end of the specimen, insignificant as displayed. A sparkling display specimen.

Browse More "Grape Amethyst" from Indonesia (click here)


About These Indonesian "Grape Amethyst" Specimens

Originally referred to as "grape agate", specimens were first found in the Mamuju area in 2015. These specimens are recovered from clay, in the spaces between the "pillows" in pillow lava.  Although they were first known as "grape agate", they are not cryptocrystalline (and therefore are not agate) - they are balls of radiating crystalline quartz. When the find first came to market, there was a large amount of material, much of which was poor quality. With the passage of time, the diggers began to produce higher quality specimens. The recent article on this material in the Mineralogical Record (Nov-Dec. 2018) observes that the production of fine specimens is beginning to decline, although there are still a few very active teams working the deposits. The article speculates, based upon local sources, that all specimen mining of the pillow lava deposits will likely cease within the next three to four years. As with all mineral specimen localities, the ultimate accuracy of such speculation varies. In this case, the limited geographical extent of the known pillow lava deposits is a key factor.

Detailed Description

Clustered intergrown lilac amethyst balls with nice form and lustre. In excellent condition, a couple of incomplete balls at either end of the specimen, insignificant as displayed. A sparkling display specimen.

Browse More "Grape Amethyst" from Indonesia (click here)


About These Indonesian "Grape Amethyst" Specimens

Originally referred to as "grape agate", specimens were first found in the Mamuju area in 2015. These specimens are recovered from clay, in the spaces between the "pillows" in pillow lava.  Although they were first known as "grape agate", they are not cryptocrystalline (and therefore are not agate) - they are balls of radiating crystalline quartz. When the find first came to market, there was a large amount of material, much of which was poor quality. With the passage of time, the diggers began to produce higher quality specimens. The recent article on this material in the Mineralogical Record (Nov-Dec. 2018) observes that the production of fine specimens is beginning to decline, although there are still a few very active teams working the deposits. The article speculates, based upon local sources, that all specimen mining of the pillow lava deposits will likely cease within the next three to four years. As with all mineral specimen localities, the ultimate accuracy of such speculation varies. In this case, the limited geographical extent of the known pillow lava deposits is a key factor.