STAUROLITE
STAUROLITE
SPECIMEN NR #:697
Staurolite is a nesosilicate mineral that ranges in color from reddish-brown to black and is primarily opaque, exhibiting a white streak. It crystallizes within the monoclinic system and possesses a Mohs hardness of 7 to 7.5, with the chemical formula Fe2+2Al9O6(SiO4)4(O,OH)2. Iron can be substituted by magnesium, zinc, and manganese, while trivalent iron may replace aluminum.
This mineral is frequently found in a distinctive cross-shaped twinning known as cruciform penetration twinning. In hand samples, staurolite crystals are typically prismatic and can form porphyroblasts. Under thin section examination, staurolite often displays twinning and exhibits lower first-order birefringence akin to quartz, with optical continuity in the twinning. It is identifiable in metamorphic rocks by its characteristic "swiss cheese" appearance, often accompanied by poikilitic quartz and a mantled porphyroblastic structure. The name staurolite is derived from the Greek words for cross and stone, reflecting its common twinning pattern.
Specimen details
Specimen details
The numbers under "variant" are the measurements in mm and weight in grams. Where known, the origin of the specimen is mentioned. The number at the end, is the specimen number in our collection. Colours may vary, due to photography.
Care
Care
It's important to know that many minerals can be effectively cleaned with water. However, before using any cleaning methods, such as dissolvers or ultrasound, please take the time to research online. Improper use of these techniques could potentially harm your specimen.
Shipping
Shipping
Shipping fees depend on the weight of your order and its destination, and they will be calculated at checkout. Not all platforms use the same rate. We will inform you about any rebates where possible. If you have any questions, feel free to reach out to us before placing your order. We strive to use the most economical shipping methods for your specimens and combine multiple orders to minimize costs. Please note that packaging is included in the shipping fees.
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