Melanothallite (original) (raw)

Colour:

Black, bluish black

Comment:

Changes to green colours upon exposure.

Cleavage:

Perfect
One direction, perfect, probably prismatic

Density:

4.08 g/cm3 (Calculated)

Crystal System:

Orthorhombic

Class (H-M):

m m m _(_2/_m_2/_m_2/m ) - Dipyramidal

Cell Parameters:

a = 9.595(3) Å, b = 9.693(3) Å, c = 7.461(3) Å

Ratio:

a:b:c = 0.99 : 1 : 0.77

Unit Cell V:

693.91 ų (Calculated from Unit Cell)

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ID	Species	Reference	Link	Year	Locality	Pressure (GPa)	Temp (K)
0005787	Melanothallite	Krivovichev S V, Filatov S K, Burns P C (2002) The cuprite-like framework of OCu4 tetrahedra in the crystal structure of synthetic melanothallite, Cu2OCl2, and its negative thermal expansion The Canadian Mineralogist 40 1185-1190		2002	synthetic	0	293

CIF Raw Data - click here to close

General Appearance of Type Material:

Place of Conservation of Type Material:

Geological Setting of Type Material:

Associated Minerals at Type Locality:

Reference:

Scacchi A (1870) Dell'eriocalco e del melanotallo, nuove specie di minerali. Rendiconto dell'Accademia delle Scienze Fisiche e Matematiche (sezione della Societa reale di Napoli) 9, 86-89

Notes:

Soluble in water. Changes to a green, more highly hydrated substance (hydromelanothallite) upon exposure.

Health Risks:

No information on health risks for this material has been entered into the database. You should always treat mineral specimens with care.

This map shows a selection of localities that have latitude and longitude coordinates recorded. Click on the symbol to view information about a locality. The symbol next to localities in the list can be used to jump to that position on the map.

- This locality has map coordinates listed. - This locality has estimated coordinates. ⓘ - Click for references and further information on this occurrence. ? - Indicates mineral may be doubtful at this locality. - Good crystals or important locality for species. - World class for species or very significant. (TL) - Type Locality for a valid mineral species. (FRL) - First Recorded Locality for everything else (eg varieties). Struck out - Mineral was erroneously reported from this locality. Faded * - Never found at this locality but inferred to have existed at some point in the past (e.g. from pseudomorphs).

All localities listed without proper references should be considered as questionable.