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This specimen weighs 82g and measures 5cm x 3cm x 3cm.

This specimen of Hemimorphite, (previously known as Calamine), with Rosasite is from the Jervois Mine, Jervois Range, Jervois Station, Central Desert Region, Northern Territory, Australia. A small abandoned Pb-Zn-Cu prospect in metamorphosed Proterozoic rocks.

There are several nearby abandoned scheelite/base metal mines with individual names, being Reward (Hanlon's Reward), Marshall (Marshall-Attutra), and Green Parrot. These mines are 12 kilometres north east of the Baikal indigenous community, on the eastern side of the Jervois Range.

Hemimorphite:-

Named in 1853 by Adolph Kenngott in allusion to the hemimorphic morphology of the crystals. Many names were previously assigned to this species, including calamine. Hemimorphite was chosen by the International Mineralogical Association, over calamine, in 1962.

Hemimorphite is a mineral that belongs to the Zinc Silicate family. Hemimorphite gets its name from the Greek words ‘hemi’ meaning half and ‘morph’meaning shape, as its crystals often display asymmetric growth patterns.

Hemimorphite is known for its unique crystal structure, which sets it apart from many other minerals. It crystallizes in the orthorhombic system and forms prismatic or tabular crystals. The crystals can vary in colour and may be transparent, translucent, or opaque. Common colors include white, yellow, blue, green, and gray, with blue being the most well known amongst crystal collectors.

Rosasite:-

Rosasite is a secondary mineral that typically forms in oxidized zones of Copper-Zinc ore deposits. It is chemically composed of Copper Zinc Carbonate Hydroxide. This mineral is recognized for its attractive blue-green color and spherical, botryoidal, or fibrous crystal habit. Rosasite is closely related to Malachite Aurichalcite and Azurite sharing similar environments of formation and physical properties. Rosasite was first discovered in the early 20th century. The mineral is named after the Rosas mine in Sardinia, Italy where it was initially found.

The chemical formula for Rosasite indicates that it primarily consists of Copper, Zinc, Carbonate, and Hydroxide ions. Structurally, rosasite belongs to the monoclinic crystal system. It features layers of carbonate ions covalently bonded to Copper and Zinc atoms, which are further linked by Hydroxide groups. This structure results in the formation of dense, botryoidal aggregates rather than well-defined individual crystals.