Pharmacosiderite Cubes | Perky Box Thumbnail Specimen | Majuba Hill, Pershing Co., Nevada USA

Pharmacosiderite is a hydrated potassium iron arsenate mineral best known for its distinctive cubic crystals and attractive green colour. Crystals range from emerald and apple green to olive green and can have a vitreous to resinous lustre. It typically forms in the oxidized portions of mineral deposits.

Majuba Hill Mine in Nevada is a well-known and respected locality for pharmacosiderite, having produced specimens with particularly attractive green cubic crystals. The mineral occurs in cavities and fractures within the altered host rock, sometimes forming dense coverings of small, well-defined crystals. It is also found in association with other secondary arsenate minerals, including arthurite and scorodite.

This large, well-defined brown cubic Pharmacosiderite crystal immediately catches the eye. Even though the color is darker than the bright olive-green cubes collectors often associate with Pharmacosiderite, the crystal form is obvious and attractive which gives it real collector appeal.

Pharmacosiderite contains arsenic and should be handled with care. Avoid creating dust or abrading the specimen, and wash your hands after handling. Keep it away from children, pets and food preparation areas. Avoid ultrasonic cleaners and chemical cleaning methods.

Name:  Pharmacosiderite Cubes
Specimen Size:  Thumbnail-Sized
Dimensions: 26x26x22 mm / 1.0x1.0x0.9 inches (including box)
Weight:  5.2 grams / 0.1 Ounces (including box)
Origin: Mined in Majuba Hill, Pershing Co., Nevada USA