Hedyphane

TSNB161
Mineral
First oxidation zoneSecond oxidation zoneThird oxidation zoneSupergene

Mineral Species

Hedyphane

Type Locality

No

Composition

Pb3Ca2(AsO4)3Cl

Crystal System

Hexagonal

Status at Tsumeb

Confirmed

Abundance

Very rare

Distribution

First, second and third oxidation zones

Paragenesis

Supergene

Entry Number

Species; TSNB161

General Notes

Hedyphane was first reported from Tsumeb by Pinch and Wilson (1977) which is surprising given that several excellent specimens (now in the Southwood Collection) were included in the research collection of Dr Bruno Geier, chief mineralogist at Tsumeb between 1952 and 1972. While hedyphane is a rare mineral at Tsumeb, certain occurrences are easily overlooked as mimetite, after which it sometimes forms pseudomorphs.


Pinch and Wilson (1977) described "… small (1 mm) crystals of white to grayish white color on calcite from the 860 m level [= 27/28 Level]."


Gebhard and Schlüter (1995) recorded a 1994 find of hedyphane from 46 Level in the third oxidation zone. According to Gebhard (1999) "… a few specimens of tan-colored crystals, up to 3 cm long, were discovered. Some crystals show hollow elongated perimorphs after an unknown mineral, probably mimetite." An example of this material is in the Pinch Collection at Harvard University (MGMH 2020.7.830).


Gebhard (1999) also noted a unique specimen with a 1 cm crystal of stolzite on a 3 x 3 cm group of hedyphane crystals.

Associated Minerals

calcite; cuprite; mimetite; smithsonite; stolzite

Pseudomorphs

Hedyphane is reported to form pseudomorphs after the following minerals: mimetite (rare).