Quartz, var. Amethyst
Posted by: macadmin on 05.14.2020 | Filed under:

Quartz, var. Amethyst

Specimen # 102292
Mineral: Quartz, var. Amethyst
Location: Quartz, var. Amethyst, Mamuju area, Sulawesi Barat Province, Sulawesi, Indonesia
Size: 7.7 x 7.7 x 3.1 cm

Description

Detailed Description

This is a cluster of grape amethyst balls with very nice lavender colour. The amethyst balls at the top and left of the piece are highly lustrous, and the balls lower on the piece are matte. There are a couple of small aggrgates of lighter amethyst that exhibit almost a wheat-sheaf style of growth. In excellent condition. An elegant, colourful 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.