China.Hemimorphite crystals # 3


1 in stock

SKU: min/hemi3-app60 Categories: ,


Location : China
Size: 4 3/4 ” x 3″ ( rock matrix )
Cost: $ 60

Note: The color is real no human alterations.


Hemimorphite Gemstone Information

About Hemimorphite – History and Introduction

Hemimorphite is an extremely rare gem quality form of zinc silicate, once referred to as ‘calamine’. The term ‘calamine’ is no longer used to refer to the gemstone, though it is still used in reference to calamine lotion, a pharmaceutical product composed of zinc and iron oxide that is used to relieve itching and minor skin irritations. Hemimorphite is very closely associated with smithsonite, another rare collector’s gem. For many years, hemimorphite and smithsonite were both classed together as calamine because they closely resemble one another. It was not until 1803 that they were discovered to be two different minerals by mineralogist, James Smithson (of the Smithsonian Institute).

Hemimorphite is a zinc silicate, while smithsonite is a zinc carbonate; zinc silicate (hemimorphite) is considered to be rarer than zinc carbonate (smithsonite). Hemimorphite is an important zinc ore and it has been mined from the upper sections of zinc ores for many years. Over half of its composition is metallic zinc. Its name ‘hemimorphite’ originates from the Greek words ‘hemi’ and ‘morph’, which respectively translate as ‘half-shape’. The name refers to its unusual hemimorphic crystal form, which means that the axial ends of crystals are asymmetrical. One end of each crystal is rather blunt, dominated by a pedion (a single face), while the other is pointed and pyramidal.

Hemimorphite can be identified by its distinct composition and unique crystal structure. Hemimorphite can be composed of over fifty percent zinc. Gemologically, it has a refractive index of 1.614 to 1.636 and a density or specific gravity of 3.30 to 3.50. Its hardness is 5 on the Mohs scale, similar toopal and turquoise. Hemimorphite may also be distinguished from other similar materials by its unique pyroelectric (charge released by temperature change) and piezoelectric (voltage produced by mechanical pressure) properties.

Hemimorphite can be found in many areas of the world, but very few deposits yield gemstone quality materials. Some of the most significant deposits are from Vieille Montagne, Belgium and Aachen, Germany.

Other notable origins include Algeria, Australia, Austria,China, England, Italy, Mexico, Poland, Russia (Siberia), Thailand, the Congo, Namibia, Madagascar and the United States, including Pennsylvania, Montana, Colorado and New Mexico.

Hemimorphite color can occur in various tones of blue, green and colorless (white). Most gemstones are blue to blue-green, and look similar to chrysocolla or turquoise. The most desirable color is sky to Swiss blue, which is reminiscent of Paraiba tourmaline. Hemimorphite often exhibits bands of blue with white streaks, and it may also be found interspersed by a dark matrix (the surrounding material).

Additional information

Weight 1 lbs
Dimensions 2 × 2 × 2 in