• Sturmanite - Wikipedia

    en.wikipedia.org/wiki/Sturmanite Sturmanite is a rare sulfate mineral with the chemical formula Ca 6 Fe 3+ 2 (SO 4) 2.5 (B(OH) 4)() 12 · 25 H 2 O. It crystallises in the tetragonal system and it has a Moh's hardness of 2.5. Sturmanite has a bright yellow to amber colour and falls in the ettringite group. It was named after Bozidar Darko Sturman (born 1937), Croatian-Canadian mineralogist and Curator Emeritus of Mineralogy ...
  • Sturmanite Mineral Data

    webmineral.com/data/Sturmanite.shtml Sturmanite Comments: Sharply terminated dark yellowish crystal of sturmanite with a few lesser crystals attached to one side. Location: N'Chwaning mine, Kalahari Manganese Field, Northern Cape Province, South Africa.
  • Sturmanite dictionary definition | sturmanite defined

    www.yourdictionary.com/sturmanite sturmanite definition: Noun 1. (mineralogy) A trigonal-ditrigonal pyramidal mineral containing aluminum, boron, calcium, hydrogen, iron, manganese, oxygen, and sulfur ...
  • Sturmanite mineral information and data

    www.dakotamatrix.com/mineralpedia/7772/sturmanite Sturmanite is an uncommon mineral found in cavities within bedded manganese deposits that have been metamorphosed. It can be found only in South Africa where it finds its type locality at, supposedly, the Black Rock mine, and in Russia.
  • Sturmanite - Crystal Classics

    www.crystalclassics.co.uk/product/sturmanite-1 A large well-defined crystal of Sturmanite measuring to 6cm tall with several crystals developed from one side, the colour varying from a translucent fawn to yellow. From the N'Chwaning II Min, South Africa.
  • STURMANITE crystal * Wessels Mine * South Africa | eBay

    www.ebay.com/itm/STURMANITE-crystal-Wessels-Mine-South-Africa-/143701022139 Sturmanite Wessels Mine * South Africa *** We Buy Collections *** 1.2 x 1 cm x 9 mm. Here is a beautiful Sturmanite crystal from the Wessels Mine * South Africa. Please note the size before you bid! ***** We do combine shipping on multiple wins. We charge actual shipping costs. The discounts is as follows:
  • Sturmanite

    e-rocks.com/minerals/5895/sturmanite Brucite Sturmanite & Calcite. NChwaning II Mine, Kuruman, Kalahari, Northern Cape Province, South Africa. Miniature (4.5-7 cm) $ You are the highest bidder. You have been outbid. Proxy bid set $ Delayed bid of $ Delayed Bid is Outbid. Sold. Bid. Watch. bids (reserve not met) (reserve met) SSM793568.
  • Sturmanite Mineral Specimen For Sale - Dakota Matrix Minerals

    www.dakotamatrix.com/products/4051/sturmanite Sturmanite Formula Ca 6 Fe 3+ 2 (SO 4) 2.5 [B(OH) 4](OH) 12 ·25H 2 O Crystal System Trigonal Crystal Habit Hexagonal, Prismatic, Pyramidal Cleavage Perfect, None, None Luster Vitreous (Glassy) Color
  • Verification

    www.mindat.org/min-3817.html Large number of pages viewed. While we don't want to limit you viewing as many pages as you would like on mindat.org, we do need to prevent people from automated downloads of our content.
  • DTA, TG, AND XRD STUDIES OF STURMANITE AND ETTRINGITE ...

    pubs.geoscienceworld.org/canmin/.../dta-tg-and-xrd-studies-of-sturmanite-and In sturmanite, a polymorphic transition occurs at about 627°C. For ettringite, approximately Ca 6 Al 2 (SO 4) 3 (OH) 12 ·26H 2 O, the H 2 O(g) and SO 3 (g) are lost at about 149 and 753°C, respectively, and the residue melts at about 1176°C. Ettringite melts after the liberation of both H 2 O(g) and SO 3 (g), whereas sturmanite melts after ...