Mimetite

Object/Artifact

-

Crater Rock Museum

Name/Title

Mimetite

Entry/Object ID

2014.1.8

Description

Formula:Pb5(AsO4)3Cl Colour:Pale-yellow, yellowish-brown, orangish-yellow, orangish-red, red, green, white, colorless; colourless or faintly tinted in transmitted light. Lustre:Sub-Adamantine, Resinous Hardness:3½ - 4 Specific Gravity:7.24 Crystal System: Hexagonal Member of: Apatite Group > Apatite Supergroup Name: Named in 1835 by François Sulpice Beudant from the Greek μϊμητής for "imitator," in allusion to its resemblance to pyromorphite. Type Locality: Treue Freundschaft Mine, Johanngeorgenstadt, Erzgebirgskreis, Saxony, Germany Polymorph of:Mimetite-2M, Mimetite-MIsostructural with:Pyromorphite, Vanadinite Apatite Group. Apatite Supergroup. Mimetite-Pyromorphite Series and Mimetite-Vanadinite Series. The arsenate analogue of Pyromorphite and Vanadinite. The Pb5 analogue of Hedyphane. The hexagonal polymorph of Mimetite-M and Mimetite-2M. The Cl analogue of Unnamed (OH-analogue of Mimetite). Baker (1966) showed by synthesis that there is a complete series between mimetite, pyromorphite and vanadinite. A secondary mineral found in the oxidized zones of lead deposits. Usually found as small hexagonal prisms, often plain but may be modified, sprinkled on the matrix thinly to thickly. Its colour is quite variable, ranging from pale yellow to yellowish-brown to orange-yellow to orange-red, brownish, greenish, white and colorless.

Collection

RAGM Mineral Collection

Acquisition

Accession

2014.1

Source or Donor

Crater Rock Museum (unknown donors)

Acquisition Method

Gift

Dimensions

Height

2-3/8 in

Width

1-3/8 in

Length

1-3/4 in

Location

Location

Display Case

FS-11

Room

Frieda Smith Hall

Building

Crater Rock Museum

Date

July 22, 2023