General Information:
Chemical Formula:
MgFe+++(SO4)2(OH)·7(H2O)
Composition:
(Molecular Weight = 415.39 gm)
Magnesium 5.85 % Mg
Iron 13.44 % Fe
Hydrogen 3.64 % H
Sulfur 15.44 % S
Oxygen 61.63 % O
Empirical Formula:
MgFe3+(SO4)2(OH)·7(H2O)
Name Origin:
From the Greek, botrys, meaning "grape' and genos, meaning "to yield."
Physical Properties:
Cleavage:
[010] Perfect, [110] Poor
Color:
hyacinth red or ocher yellow.
Density:
2 - 2.1, Average = 2.04
Diaphaniety:
Transparent to Translucent
Habits:
Botryoidal - "Grape-like" rounded forms (e.g.. malachite)., Radial - Crystals radiate from a center without producing stellar forms (e.g. stibnite), Reniform - "Kidney like" in shape (e.g.. hematite).
Hardness:
2 - Gypsum
Luminescence:
None.
Luster:
Vitreous (Glassy)
Streak:
ochre yellow
More details...