At the Brown Monster mine goethite and kaolinite form casts after a bladed mineral, most likely hemimorphite.
Hemimorphite [Zn.sub.4][Si.sub.2][O.sub.7][(OH).sub.2] [H.sub.2]O
Bladed hemimorphite crystals (to 2 cm) were found in the Reward mine in one difficult-to-reach occurrence (2.5 meters up the side of a pillar).
In Veins 51 and 52 it forms excellent, fairly large, white to colorless, vertically striated, bladed crystals; however, the best crystals qualitatively, which resemble hemimorphite
, have come from Vein 53.
Basically the new specimens consist solely of yellow mimetite covering "limonite." In the same (unspecified) area of the Ojuela mine, at about the same time, hundreds of very beautiful hemimorphite
specimens were found, these consisting of sprays to more than 2 cm of lustrous white, bladed crystals rising from matrix, with tiny bright yellow spheres of mimetite around their bases.
You could have seen a good specimen in the Mineralogical Record's "what's new in minerals" case in the Clarion lobby during two days of the hotel show, and you could have seen about a dozen more in the Clarion room of Luis Burillo (see above under hemimorphite
Willemite and hemimorphite
came to be mined as ores (the lustrous white hemimorphite
specimens known as "maggot ore" began to emerge around 1875 from the opencut Noble and Passaic workings at Sterling Hill).
This may also account for the widespread formation of cave calcite, aragonite and other stalactitic minerals, such as hemimorphite
and malachite in southern and southwestern China, where a hot and wet climate prevails.
It is not unusual to have some rumor making the rounds: "Have you seen those Chinese silvers--they are molded and bent by little kids in Tianjin." "He's got a bunch of specimens marked as smithsonite from the Kelly Mine, but everyone knows they are hemimorphites
from Wenshan." "That azurite most certainly is not from Bisbee."