Kingstonite, (Rh,Ir,Pt) 3 S 4 , a new mineral species from Yubdo, Ethiopia

Petewilliamsite, (Ni,Co) 30 (As 2 O 7 ) 15 , a new mineral from Johanngeorgenstadt, Saxony, Germany: description and crystal structure

Aurivilliusite, Hg 2+ Hg 1+ OI, a new mineral species from the Clear Creek claim, San Benito County, California, USA

Tripuhyite, FeSbO 4 , revisited

Verbeekite, monoclinic PdSe 2 , a new mineral from the Musonoi Cu-Co-Mn-U mine, near Kolwezi, Shaba Province, Democratic Republic of Congo

Mereheadite, Pb 2 O(OH)Cl; a new litharge-related oxychloride from Merehead Quarry, Cranmore, Somerset

A new mineral, chrisstanleyite, Ag 2 Pd 3 Se 4 , from Hope's Nose, Torquay, Devon, England

Techniques and methodology used in a mineralogical and osmium isotope study of platinum group minerals from alluvial deposits in Colombia, California, Oregon and Alaska

Feinglosite, a new mineral related to brackebuschite, from Tsumeb, Namibia

Shannonite, Pb 2 OCO 3 , a new mineral from the Grand Reef Mine, Graham County, Arizona, USA

Parkinsonite, (PB,Mo, []) 8 O 8 Cl 2 , a new mineral from Merehead Quarry, Somerset

Deanesmithite, Hg (super 1+) 2 Hg (super 2+) 3 Cr (super 6+) O 5 S 2 , a new mineral species from the Clear Creek Claim, San Benito County, California

The optical properties of montbrayite, Au 2 Te 3 , from Robb Montbray, Quebec, compared with those of the other gold tellurides

Cervelleite, Ag 4 TeS, a new mineral from the Bambolla Mine, Mexico, and a description of a photo-chemical reaction involving cervelleite, acanthite and hessite

Hawthorneite, Ba[Ti 3 Cr 4 Fe 4 Mg]O 19 ; a new metasomatic magnetoplumbite-type mineral from the upper mantle

Editorial policy for the second issue of the IMA/COM quantitative data file

Error problems in the two-media method of deriving the optical constants n and k from measured reflectances