Locality: Unknown

Scorodite A common iron arsenate mineral (ie it is poisonous so treat specimens with care), it is named from the Greek word for garlic, since it emits a scent when heated that brings this bulb to mind. It forms in hydrothermal veins precipitating from hot fluids. Locations include Namibia (including the Tsumeb mine from which this piece hails, see http://on.fb.me/1c2CjkD for a more detailed insight into this Mecca of mineral collectors), Germany, the UK and many others. Colours vary from a variety of greens or blues to brown. This lovely piece measures 8x5x3cm and displays a rare and vibrant blue hue. The matrix is made of the complex polymetallic mineral beudantite. Loz Image credit: Rob Lavinsky/iRocks.com http://www.mindat.org/min-3595.html http://bit.ly/1f9jeyt http://bit.ly/1KiNDTG

Botryoidal adamite While we have covered this mineral before (seehttp://tinyurl.com/qbm57vs), this lovely encrustation of hydrated zinc arsenate is a lovely specimen. It comes from Toole in Utah and measures 6x4.5x4cm. Loz Image credit: Rob Lavinsky/iRocks.com

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