Native Silver Copper Halfbreed Specimen Michigan 10.45 gm 26 mm

Description

Native Silver Copper Halfbreed Mineral Specimen Michigan 10.45 gm 26 x 21 mm
Description
Beautiful specimen  of native silver on native copper formation with copper ore matrix.    The colors are very beautiful with the silver and oxidized copper in contrast with the areas of matrix ore.
Native copper has been mined for centuries and now is all but depleted, though it is still found in limited quantities in once-active mining regions. Native silver is even more rare.  These finds are now valuable as mineralogical specimens and ornamental pieces.  From Keweenaw County, Upper Peninsula, Michigan, USA.
Physical Characteristics:
Silver
Color
is silver white.
Luster
is metallic.
Transparency
is opaque.
Crystal System
is isometric; 4/m bar 3 2/m
Crystal Habits
include massive and disseminated grains. "Jack Frost" type crystal growth produces beautiful intricate structures.
Cleavage
is absent.
Fracture
is jagged.
Streak
is silver white.
Hardness
is 2.5-3.
Specific Gravity
is variable according to purity 10-12 (well above average even for metallic minerals)
Copper
Color
is copper colored with natural patina
Luster
is metallic.
Transparency
is opaque.
Crystal System
is isometric; 4/m bar 3 2/m
Crystal Habit is
arborescent or branching form.
Cleavage
is absent.
Fracture
is jagged.
Streak
is reddish copper color.
Hardness
is 2.5-3
Specific Gravity
is 8.9+ (above average for metallic)
Dimensions:
26mm x 21mm
A specimen like this is rarely found.
Gold Jewelers Gift Box included
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