Skip to product information
1 of 6

CRYSTALS2COLLECT A.C.N 651.525.727 Pty Ltd

STAUROLITE with ALMANDINE GARNET (large cabinet)

STAUROLITE with ALMANDINE GARNET (large cabinet)

Regular price $962.50 AUD
Regular price Sale price $962.50 AUD
Sale Sold out
Taxes included. Shipping calculated at checkout.
Size (HWD in mm) weight in gr
Origin
Specimen nr.

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.

Almandine, also referred to as almandite, is a mineral within the garnet group. Its name derives from "alabandicus," a term used by Pliny the Elder for a stone sourced from Alabanda, a town in ancient Caria, Asia Minor. Characterized by its deep red to purplish hue, almandine is an iron alumina garnet often shaped with a convex surface, known as carbuncle when polished. Under strong light, it typically reveals three distinct absorption bands when examined with a spectroscope.

As one end-member of a solid solution series, almandine pairs with pyrope as the other end member. Its chemical formula is Fe3Al2(SiO4)3, with magnesium capable of substituting for iron in compositions that lean towards pyrope. Almandine, represented as Fe2+3Al2Si3O12, is a significant ferrous iron end member among garnet minerals, which are vital components of rock-forming silicates found in the Earth's crust, upper mantle, and transition zone.

Former John Betts Collection NY #12171

Shipping & Returns

See our Shipping and Return Policies for details.

Our comprehensive policies about your privacy, refunds, shipping, contact information and terms of trade can be found at the foot of our website. Please, read the policies carefully before placing an order as they are part of the purchase agreement.

Our friendly staff is here to help you with any issue.

The Management
Crystals2Collect

Dimensions and Weight

Dimensions and Weight are mentioned n the product description and will be used during check out to calculate the shipping costs. For example: 55 45 25 127 means Length 55 mm, Width 45 mm, Height 25 mm, Weight 127 grams. The weight is the approximate nett weight of the specimen including the mount (where applicable).

View full details
  • Shipping

    Shipping is calculated at the checkout and may vary due to destinations, events and restrictions.

  • Hassle-Free Exchanges

    If you're not completely happy with your purchase, please reach out to us for assistance with an exchange or return within 20 days after receiving your order. We kindly ask that you do not send back any items without first consulting us for guidance. Please be aware that we cannot accept returns for items that are broken, damaged, radioactive or where returns have been limited or excluded in our Terms of Service or announcement. Thank you for your understanding!