Hemimorphite

Name Hemimorphite
Scientific Name Zn4 Si2 O7 (OH)2 -H2O), hydrated zinc silicate hydroxide
Category Minerals & meteorite
Origion Yunnan China


It has unique polar or hemimorphic crystals from where it gets its name. Speciemens of hemimprhpite tend to be of two different forms. One form produces very glossy, clear or white, thin, bladed crystals, often well formed showing many crystal faces. Many times these crystals are arranged in fan shaped aggregates. The other from produces a blue to blue-green botryoidal crust that resembles smithsonite or prenite.

In many cases, it is often confused with smithonite. I found this really nice method of differentiate the two: “The carbonate (smithsonite) dissolves in warm acid with some effervescence, while the silicate (hemimorphite) dissolves slowly and quietly, leaving gelatinous silica. Smithsonite has a higher density as well a shimering luster that causes a play of light across the rounded surfaces. The two species also show differences in the way they cleave. Smithsonite knobs break with a ready convex (rhombohedral) cleavage not characteristic of hemimorphite. Hemimorphite is slightly harder than smithsonite.”




Collecting Chalcopyrite

Be aware of fake hemimorphite that are made from aragonite!!! In many cases, people use colorless or grey aragonite and dyed them blue to make them resemble hemimorphite. The dyed aragonite has a smoother look to it than natural bule hemimorphite. If you suspect your item is an aragonite, place a few drops of common pool acid such as muratic or hydrochloric acid on the item. If it starts bubbling then you know your item is a chuck of aragonite.

Physical Description:

Though a few places were chipped, the specimen still retains a beautiful rich hue though out. The nice bubbling looking blue crystal formations are in various sizes. The two longest length are 4.375 inches and 3.75 inches. It weights about 11.3 oz.