Goethite - a-FeO(OH) - Goethite is a common alteration product formed by the weathering of the Mascot vein material. It is found as earthy or velvety brown patches in pieces rich with primary sulfides. Goethite has also been noted as shiny black or ochre-yellow crusts with a smooth outer surface.

Gypsum- CaSO4.2H2O - Colorless gypsum crystals to 2mm were found on one occasion growing on a dump boulder. The gypsum crystals were clearly post-mining in origin.

Hydrozincite (?) - Zn5(CO3)2(OH)6 - A mineral that forms as a white chalky crust is believed to be hydrozincite largely because it is fluorescent. It hasn't been otherwise tested.

Linarite- CuPbSO4(OH)2 - Gorgeous microcrystals of linarite have been found at the Mascot where it forms as distinct tabular crystals, either as individuals or as groups of subparallel plates resembling an open book. Stout crystals are a deep azure blue, while extremely thin blades are a pale blue. The crystals are transparent, but become an opaque blue-gray when weathered. Although crystals average only .5mm across, their sharpness and vivid color make them one of the most sought after Mascot mineral species. Linarite is relatively common, occurring on the surface of dump material and also within the sulfide and quartz matrix. It has not been found in the siderite vugs.

Malachite - Cu2CO3(OH)2 - Malachite is common as green botryoidal crystals and crusts that have an earthy surface appearance.  Acicular malachite has not been identified from this locality.

Metazeunerite -Cu(UO2)2(AsO4)2.8H2O Metazeunerite is known from a single find where it forms tiny clusters of yellow-green tetragonal plates on sphalerite. It is, thus far, the only secondary mineral at this locality containing arsenic. The source of uranium likely came from the granite country rock that hosted the Mascot vein.

Posnjakite - Cu4SO4(OH)6.H2O -  Posnjakite crystals at the Mascot are a distinct aqua blue, a different shade of blue than linarite. The crystals (about 1mm.) tend to be rounded without sharp crystal angles. Often they appear as stubby pseudo-hexagonal barrels. Rarely elongated crystals are encountered. Posnjakite is moderately common and is often associated with schulenbergite.

Pyrite - FeS2 -  Pyrite is common in the mixed sulfide assemblage in massive form and also as inter-grown cubic crystals. It also is found within seams of a very fine- grained siderite matrix. Here other crystal forms are noted besides the cube including octahedrons, pyritohedrons, and elongated crystals.

Quartz- SiO2 - Quartz is common in massive form. Some plates of crystals have been found, but usually the crystals (to 3cm) are rather dull in luster. In contrast, clear and lustrous microcrystals of quartz are commonly found within the siderite vugs.

Rosasite (?) - (cu,Zn)2CO3(OH)2 - A mineral that forms as blue to blue-green botryoidal crystals with a very smooth outer surface was thought to be smithsonite. Analysis showed it to be a carbonate of both copper and zinc. Because of its crystal shape rosasite is the most likely mineral that this could be. It is uncommon at this locality. Rounded smooth spheroids of a deep green color may be this mineral as well.

Schulenbergite- (Cu,Zn)7(SO4,CO3)2(OH)10 Schulenbergite forms on the surface of the dump rocks as a flaky crust that is a lively sky blue color with a pearly luster. Individual crystal aggregates are composed of curved foliated sheets that overlap into crude hemispheres and rosettes.

Serpierite- Ca(Cu,Zn)4(SO4)2(OH)6.3H2O Serpierite is rather uncommon, forming as crusts upon the dump material. The crusts are made up of individual flat needles of a light to medium blue color. This mineral can easily be mistaken for blue Mascot aurichalcite. If large enough individual blades are present, an examination of the terminations will distinguish the minerals. Aurichalcite with it's orthorhombic symmetry features "picket fence" terminal ends, while the serpierite shows the oblique angle characteristic of monoclinic minerals. Aurichalcite will fizz when exposed to acid, while serpierite will not.

Siderite - FeCO3 - Siderite is an abundant gangue mineral and is present in large blocks within the Mascot dumps.

Con't. on page 8.