barite, witherite, fluorite, and the Cornish rarity, fluellite
The specimens consist of blue micro-spheres of nevadaite associated with microcrystals of fluellite
Locally abundant specimens of large and well-crystallized wavellite, fluellite and minyulite are present in quartz crystal-lined vugs, along with other minerals including native selenium, and a suite of associated phosphates.
A carbonaceous and sulfide-bearing shale horizon just barely exposed at the bottom of the northernmost pit of the Willard mine contains excellent wavellite, fluellite and minyulite.
It is the site of the first discovery of minyulite in Nevada; it has produced the world's largest crystals of fluellite and perhaps also minyulite; and it has furnished what are by far the finest quality specimens of wavellite, fluellite and minyulite ever discovered in the state.
Magnificent, mirror-lustrous crystals of colorless to pale lavender fluellite have been found at the Willard mine.
Other United States localities for fluellite include a single specimen with crystals to 4 mm from the Carolina Pyrophyllite mine, Randolph County, North Carolina (Dunn, 1977), and dull white crystals to 1 mm from the Tuscarora mine, Rich County, Utah (Robinson, 1993).
Minerals in the pegmatite are: quartz, microcline, muscovite, albite, amblygonite, "apatite," beryl, uraninite, elbaite, members of the tantalite group, secondary uranium minerals, triphylite, triplite, purpurite, rockbridgeite, tavorite, barbosalite, hureaulite, eosphorite, phosphosiderite, carlhintzeite, colquirite, pachnolite, ralstonite and fluellite
Among those identified are burangaite (second world occurrence), corderoite, fervanite, fluellite, hewettite, heyite, kazakhstanite, mandarinoite, richellite, schubuelite (second world occurrence), sincosite, tinticite (in crystals
Radiating sprays of brilliant maroon-red hewettite crystals, lustrous golden yellow fluellite crystals, and dense mats of intergrown selenium crystals are only a few of the interesting discoveries made recently.
Associated (later) minerals include variscite, fluellite, leucophosphite, unknown #1, hewettite, tyuyamunite, torbernite and tiemannite/ corderoite, commonly all on the same specimen.
2 mm occur rarely as an associated mineral with wavellite, fluellite, aluminian strengite and hewettite.