Agakhanovite-(Y), ideally (YCa)□ 2 KBe 3 Si 12 O 30 , a new milarite-group mineral from the Heftetjern pegmatite, Tørdal, Southern Norway: Description and crystal structure

Bederite, a new pegmatite phosphate mineral from Nevados de Palermo, Argentina; description and crystal structure

Niobian rutile from the McGuire granitic pegmatite, Park County, Colorado; solid solution, exsolution, and oxidation

Ferrotitanowodginite, Fe (super 2+) TiTa 2 O 8 , a new mineral of the wodginite group from the San Elias pegmatite, San Luis, Argentina

Crystal-structure refinement of a rubidian cesian phlogopite

Rubicline, a new feldspar from San Piero in Campo, Elba, Italy

Rossmanite, [](LiAl 2 )Al 6 (Si 6 O 18 )(BO 3 ) 3 (OH) 4 , a new alkali-deficient tourmaline; description and crystal structure

Compositional and structural systematics of the columbite group

The crystal chemistry of the milarite-group minerals

Fractionation trends of the Nb- and Ta-bearing oxide minerals in the Greer Lake pegmatitic granite and its pegmatite aureole, southeastern Manitoba

Polylithionite from the rare-metal deposits of the Blachford Lake alkaline complex, N.W.T., Canada

First U.S. occurrence of wodginite from Powhatan County, Virginia

The fluorine content and some physical properties of the amblygonite montebrasite minerals