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stoneandviolet:

New sets coming this week! To start, I will have a new Complete Mountain set in the shop today (shortly!) It’s going to include these three lovely pieces. A mini petrified wood log with one polished face, a sparkling little natural smoky quartz cluster, a large crystal point for the peak, and 14 additional crystals/minerals. This set will show up at the top of the Complete Sets section and will have the word NEW in the title. #petrifiedwood #quartzcrystal #smokyquartz #smokeyquartz

mineralogue:

Antlerite is a green copper sulphate mineral, with the chemical formula Cu3(SO4)(OH)4. Its colour ranges in shade from light green to emerald green to black, and is translucent with a pale green streak. It has a hardness of 3-3.5. Antlerite occurs in weathered zones of carbonate-poor copper deposits in arid areas. It was originally thought to be fairly rare, but was discovered to be the main ore at the Chuquicamata mine in Chile and Antler mine in Arizona, USA, the latter of which lends the mineral its name. Antlerite is soluble in dilute sulphuric acid; however it can be distinguished from similarly coloured malachite because it does not dissolve in hydrochloric acid (malachite does). It may also be confused with brochantite, with which it is closely related. However, antlerite is less common.

Sources:

Wikipedia | Mindat 

Image: Antlerite from Ingadanais Mines, Castelo Branco, Portugal, by Leon Hupperichs, via Wikimedia Commons. Picture width: 3mm.

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