Esperite

Esperite is a rare complex calcium lead zinc silicate (PbCa3Zn4(SiO4)4) related to beryllonite and trimerite that used to be called calcium larsenite. It occurred on the 400 foot level, approximately 1080 feet north of the north side of the Palmer Shaft pillar and other parts of the Franklin, New Jersey ore body.It has a white, greasy appearance in daylight and is much prized for its brilliant yellow green fluorescence under shortwave ultraviolet light. Found in association with calcite, franklinite, willemite, hardystonite and clinohedrite. Also found as prismatic crystals up to 1 mm in length at the El Dragon Mine, Potosi, Bolivia in association with allophane, chalcomenite, clinochalcomenite and barite.
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v. carry out, accomplish, perform (bureaucratic jargon)

General Information:
 Chemical Formula:
PbCa3Zn4(SiO4)4
 Composition:
(Molecular Weight = 957.33 gm)
Calcium 12.56 % Ca
Zinc 27.32 % Zn
Silicon 11.73 % Si
Lead 21.64 % Pb
Oxygen 26.74 % O 
 Empirical Formula:
PbCa3Zn4(SiO4)4
 Environment:
Metamorphosed zinc deposits associated with larsenite.
 IMA Status:
Approved IMA 1965
 Locality:
Franklin, Sussex Co., New Jersey, USA.
Physical Properties:
 Cleavage:
[???] Indistinct
 Color:
white.
 Density:
4.421
 Diaphaniety:
Subtranslucent to opaque
 Habits:
Massive - Uniformly indistinguishable crystals forming large masses., ,
 Hardness:
5 - Apatite
 Luminescence:
Fluorescent.
 Luster:
Vitreous (Glassy)
 Streak:
white
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