...Howard T. Evans, Jr.; Mary E. Mrose Abstract Montroseite, (V, Fe)O(OH), has been shown by Evans and Block to have a structure analogous to that of diaspore, AlO(OH). Altered crystals of montroseite give multiple x -ray patterns showing one sharp orthorhombic lattice corresponding to the host...

...Alice D. Weeks; Evelyn A. Cisney; Alexander M. Sherwood Abstract Montroseite, a new vanadium mineral named from Montrose County, Colo., has been found in four mines in western Colorado and in two mines in eastern Utah. It is black, opaque, submetallic, and occurs in microscopic bladed crystals...

...Howard T. Evans, Jr.; Stanley Block Abstract An x -ray study of single crystals of montroseite, (V, Fe)O(OH), shows that the mineral has a structure analogous to that of diaspore, AlO(OH). Cell constants are given as: orthorhombic, space group Pbnm (D 2h 16 ); a = 4.54, b = 9.97, c = 3.03 Å; cell...

...Anthony R. Kampf; John M. Hughes; Chi Ma; Joe Marty ABSTRACT Pseudodickthomssenite (IMA2021-027), Mg(VO 3 ) 2 ·8H 2 O, is a new mineral discovered at the Pickett Corral mine, Bull Canyon, Montrose County, Colorado, USA. The mineral formed from the oxidation of montroseite-corvusite assemblages...

... polycrystalline coatings on rounded quartz grains or masses of montroseite, and rarely as tablets or blades. It grows on corvusite-montroseite-bearing sandstone blocks intimately associated with gypsum, huemulite, hummerite, metamunirite, and munirite. Bluestreakite is dark greenish blue, with a light blue streak...

..., which are made up of rutile [TiO 2 ] and montroseite [V 3+ O(OH)] slices. In tivanite the rutile:montroseite ratio is 1:1, in kyzylkumite the ratio is 2:1. The montroseite module may be replaced by the isotypic paramontroseite V 4+ O 2 module, which produces a phase with the formula Ti 2 V 4+ O 6...

... and montroseite- and corvusite-bearing sandstone in association with baryte, chalcomenite, and volborthite. The mineral forms as brown equant (pseudocubic) or colorless bladed crystals. The streak is white, luster is vitreous to greasy, Mohs hardness is 2½, tenacity is brittle, and fracture is conchoidal...

...Fig. 2. Chinleite-(Ce) prisms associated with boltwoodite (yellow) on phlogopite veneer coating montroseite-corvusite-bearing sandstone; field of view 0.43 mm across; cotype specimen #76337. ...

... Valley, Montrose County, also in Colorado. The mineral is rare; it occurs with dickthomssenite on montroseite- and corvusite-bearing sandstone. Crystals of okieite from the Burro mine are equant to prismatic, commonly appearing like curving columns (up to about 3 mm in length) and often exhibiting...

... of lumsdenite occur as blades up to 0.2 mm in length, commonly growing in sprays. The crystals are dark green blue, with a green-blue streak. The mineral occurs on asphaltum, associated with montroseite- and corvusite-bearing sandstone. Other secondary minerals found in close association with lumsdenite...

... on montroseite-corvusite-bearing sandstone. Crystals are dark red-brown, often appearing black. The streak is orange, and the luster is vitreous. Bicapite is brittle, has a Mohs hardness of 1½, and displays one excellent cleavage on {100}. The measured density is 2.44(2) g/cm 3 . Bicapite is uniaxial (+), ω...

... occurs as crusts on montroseite- and corvusite-bearing sandstone in an NH 4 -rich secondary assemblage also containing ammoniozippeite and the NH 4 -bearing decavanadates schindlerite and wernerbaurite. The crusts, up to 2 mm or more across, exhibit consistently oriented faces. Ammoniolasalite crystals...

...-yellow, somewhat flattened prisms up to 2 mm in length occurring on a montroseite- and corvusite-bearing sandstone. Burroite has yellow streak, vitreous luster, brittle tenacity, a Mohs hardness of 1½–2, good cleavage on {001}, and irregular fracture. The measured density is 2.43(2) g·cm –3...

... associated with montroseite- and corvusite-bearing sandstone. Hydropascoite is dark yellow green, with a pistachio green streak, vitreous luster, Mohs hardness of ca . 1½, brittle tenacity, irregular fracture, and one perfect cleavage on {001}. Density (meas.) is 2.38(2) g/cm 3 . Hydropascoite is biaxial...

...Anthony R. Kampf; John M. Hughes; Barbara P. Nash; Joe Marty Abstract Kegginite, Pb 3 Ca 3 [AsV 12 O 40 (VO)]·20H 2 O, is a new mineral species from the Packrat mine, near Gateway, Mesa County, Colorado, U.S.A. It is a secondary mineral found on asphaltum in a montroseite-and corvusite-bearing...

... on montroseite- and corvusite-bearing sandstone in association with pharmacolite. Vanarsite is monoclinic, P 2 1 / c , a 25.8902(8), b 10.9468(3), c 28.2980(8) Å, β 102.252(1)°, V 7828.9(3) Å 3 , and Z = 2. Packratite is triclinic, P , a 18.0572(4), b 19.4126(4), c 24.0586(17) Å, α 87.364(6), β 86.266(6), γ...

... occurs as blades on a corvusite-montroseite-bearing sandstone block intimately associated with calcite, gypsum, huemulite, pascoite, rossite, and sherwoodite. Nashite is bluish-green, with a light bluish-green streak. The mineral is transparent, with a subadamantine luster. Nashite does not fluoresce...