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Ekatite. Comments: Divergent spray of dark brown acicular ekatite crystals. Location: Tsumeb mine, Namibia.. Scale: 15 mm Tall. © William Pinch. Ekatite Crystallography. Axial Ratios: a:c = 1:0.39544. Cell Dimensions: a = 12.773, c = 5.051, Z = 1; V = 713.66 Den (Calc)= 4.10. Crystal System:
Crystal System: Hexagonal. Name: Named in honor of Dieter Ekat (1935-1996), a Namibian mining engineer and owner of the Rubikon Mine. Type Locality: ⓘ Tsumeb Mine, Tsumeb, Oshikoto Region, Namibia. This page provides mineralogical data about Ekatite.
Jul 1, 2001 · Ekatite, ideally (Fe 3+, Fe 2+, Zn) 12 (OH) 6 [AsO 3] 6 [AsO 3 HOSiO 3] 2, is a new mineral from Tsumeb, Namibia. It is associated with chalcocite and occurs as small sprays of fine needles, up to 2 mm long and less than 0.2 mm in diameter.
Ekatite (Fe3+,Fe2+,Zn) 12 (OH) 6 [AsO 3] 6 [AsO 3,HOSiO 3] 2 Crystal Data: Hexagonal. Point Group: 6mm. As sprays of acicular crystals to 2 mm, elongated along [001] and striated. Physical Properties: Cleavage: None. Fracture: n.d. Tenacity: Brittle.
Keller, P. (2001) Ekatite, (Fe3+,Fe2+,Zn)12(OH)6[AsO3]6[AsO 3,HOSiO3]2, a new mineral from Tsumeb, Namibia, and its crystal structure. European Journal of Mineralogy: 13: 769-777.; The Mineralogical Record: 33: 162.
Name: Ekatite RRUFF ID: R110136 Ideal Chemistry: (Fe 3+,Fe 2+,Zn) 12 (AsO 3) 6 (AsO 3,SiO 3 OH) 2 (OH) 6 Locality: Tsumeb, Namibia Source: William W. Pinch Owner: RRUFF Description: Radiating aggregate of thin black prismatic crystals
My thanks are also due to Ernst Schnaitmann for information regarding the origin of ekatite specimens and to Bob Downs (RRUFF Project, University of Arizona) for the photographs of the ekatite specimen in the collection of the late William Pinch.