greenockite
Sign in to saveGreenockite, also cadmium blende or cadmium ochre (obsolete) is a rare cadmium bearing metal sulfide mineral consisting of cadmium sulfide (CdS) in crystalline form. Greenockite crystallizes in the hexagonal system. It occurs as massive encrustations and as hemimorphic six-sided pyramidal crystals which vary in color from a honey yellow through shades of red to brown. The Mohs hardness is 3 to 3.5 and the specific gravity is 4.8 to 4.9.
Key facts
- Mineral.Jmol
- [CdH2-2]1[SH+2]([CdH2-2]6)[CdH2-2][SH+2]7[CdH-2]2[S+2][Cd-2]3([S+2][CdH-2]9[S+2]5)[S+2]18[Cd-2]45[S+2][CdH-2]5[SH+2]6[Cd-2]78[S+2]78[CdH2-2][SH+2]5[CdH2-2][S+2]4([CdH2-2][SH+2]9[CdH2-2]4)[CdH-2]7[S+2]34[CdH2-2][SH+2]2[CdH2-2]8
- Mineral.pleochroism
- Weak
- Mineral.name
- Greenockite
- Mineral.category
- Sulfide mineral
- Mineral.image
- Greenockite-259580.jpg
- Mineral.imagesize
- 260px
- Mineral.caption
- Greenockite crystals from Tsumeb Mine, Namibia (Picture width 1 mm)
- Mineral.formula
- CdS
- Mineral.IMAsymbol
- Gnk
- Mineral.molweight
- 144.48
- Mineral.strunz
- 2.CB.45
- Mineral.system
- Hexagonal
- Mineral.class
- Dihexagonal pyramidal (6mm) (same H-M symbol)
- Mineral.symmetry
- P63mc
- Mineral.unit cell
- a = 4.136 c = 6.713 [Å]; Z = 2
- Mineral.color
- Honey yellow, citron yellow, orange yellow
- Mineral.habit
- Colloform – forming from a gel or colloidal mass; encrustations – forms crust-like aggregates on matrix; radial – crystals radiate from a center without producing stellar forms (e.g. stibnite)
- Mineral.twinning
- Rare on {112} forming trillings
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{{Infobox mineral | name = Greenockite | category = Sulfide mineral | image = Greenockite-259580.jpg | imagesize = 260px | caption = Greenockite crystals from Tsumeb Mine, Namibia (Picture width 1 mm) | formula = CdS | IMAsymbol = Gnk | molweight = 144.48 | strunz = 2.CB.45 | system = Hexagonal | class = Dihexagonal pyramidal (6mm) (same H-M symbol) | symmetry = P63mc | unit cell = a = 4.136 c = 6.713 [Å]; Z = 2 | color = Honey yellow, citron yellow, orange yellow | habit = Colloform – forming from a gel or colloidal mass; encrustations – forms crust-like aggregates on matrix; radial – crystals radiate from a center without producing stellar forms (e.g. stibnite) | twinning = Rare on {112} forming trillings | cleavage = Distinct on {112}, imperfect on {0001} | fracture = Conchoidal | tenacity = Brittle | mohs = 3.0–3.5 | luster = Adamantine to resinous | refractive = nω = 2.529 nε = 2.506 | opticalprop = Uniaxial (−) | birefringence = δ = 0.023 | pleochroism = Weak | streak = Yellow orange to brick red | gravity = 4.8–4.9 | melt = | fusibility = | diagnostic = | solubility = | diaphaneity = Nearly opaque to translucent | fluorescence = yellow-orange fluorescence under UV when rich in zinc | other = Toxic | references = | SMILES = [CdH2-2]1[S+2]47[CdH-2]2[S+2][CdH-2]3[S+2]8([CdH2-2][SH+2]([CdH2-2]4)[CdH2-2]6)[CdH-2]4[S+2][CdH-2]5[S+2]6([CdH2-2]6)[Cd-2]78[S+2]78[CdH-2]([SH+2]69)[SH+2]5[CdH2-2][SH+2]4[CdH-2]7[SH+2]3[CdH2-2][SH+2]2[CdH-2]8[SH+2]1[CdH2-2]9 | Jmol = [CdH2-2]1[SH+2]([CdH2-2]6)[CdH2-2][SH+2]7[CdH-2]2[S+2][Cd-2]3([S+2][CdH-2]9[S+2]5)[S+2]18[Cd-2]45[S+2][CdH-2]5[SH+2]6[Cd-2]78[S+2]78[CdH2-2][SH+2]5[CdH2-2][S+2]4([CdH2-2][SH+2]9[CdH2-2]4)[CdH-2]7[S+2]34[CdH2-2][SH+2]2[CdH2-2]8
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