I still have a piece of tourmaline that I found on a Boy Scout field trip.
A lot of tourmaline was mined in Brazil, but all the red ones were from just one place and now they're gone".
We measured the widths and lengths of tourmaline grains and the distances of the inter-boudin gaps in microboudinaged tourmaline grains on foliation surfaces, for grains with long axes oriented within 15° of the mineral lineation (Fig. 5).
Moreover, straight run asphalt and polymer modified asphalt containing various percentages of two kinds of tourmaline as asphalt modifier were also prepared to gain the knowledge of the interaction between asphalt and tourmaline.
A Microsoft Visual Basic program, WinTcac, has been developed to calculate structural formulae of tourmaline analyses based on the Subcommittee on Tourmaline Nomenclature (STN) of the International Mineralogical Association's Commission on New Minerals, Nomenclature and Classification (IMA-CNMCN) scheme.
The results show that the elastic matrix model is the more appropriate probability density function for analysis of fracturing of tourmaline grains in a quartz matrix.
The finest specimens of tourmaline, rhodochrosite and crystallized gold are fetching more than $1 million apiece about five times what they sold for five years ago, Heritage says.
Thus, these statistical constraints identify the elastic matrix model as the appropriate model for the fracturing of tourmaline grains in all the analysed samples (Table 1).
Boron is one of the major elements of tourmaline.
The general mineralogical composition of the Cape Coast granitoid complex includes quartz, muscovite, biotite, microcline, albite, almandine, beryl, spessartite, tourmaline, columbite/tantalite and kaolin (Kesse 1985).
