Franklin Quarry, Franklin Marble, Franklin, Sussex County, New Jersey, USA (original) (raw)

Habit: First and second order prisms and first and second order trigonal pyramids. Crystals are generally equant to only slightly elongated along "c".

Colour: Full range of light to dark green shades including olive green and brownish green through greenish brown.

Fluorescence: orange yellow in short wave ultraviolet.

ⓘ Galena

Formula: PbS

ⓘ Goethite

Formula: α-Fe3+O(OH)

ⓘ Graphite

Formula: C

ⓘ Hematite

Formula: Fe2O3

ⓘ Hercynite

Formula: Fe2+Al2O4

ⓘ Magnesio-hornblende

Formula: ◻Ca2(Mg4Al)(Si7Al)O22(OH)2

ⓘ Malachite

Formula: Cu2(CO3)(OH)2

ⓘ Marcasite

Formula: FeS2

ⓘ Margarite

Formula: CaAl2(Al2Si2O10)(OH)2

ⓘ Meionite

Formula: Ca4Al6Si6O24CO3

ⓘ Microcline

Formula: K(AlSi3O8)

ⓘ Muscovite

Formula: KAl2(AlSi3O10)(OH)2

ⓘ Norbergite

Formula: Mg3(SiO4)F2

Description: Dunn (1995) gives the following account: “Fine, yellow, euhedral norbergite crystals, up to 25 mm in clusters to 3 x 2 x 2 cm, were found in the Franklin Quarry in 1982 and have the tabular habit figured by Palache. In this occurrence, norbergite is associated with calcite, hercynite, and phlogopite."

ⓘ Pargasite

Formula: NaCa2(Mg4Al)(Si6Al2)O22(OH)2

ⓘ ~~Phlogopite~~

Formula: KMg3(AlSi3O10)(OH)2

Description: Identified before the nomenclature changes by IMA mica-group subcommittee of the IMA. All known analyses show Fluorine dominant over hydroxyl. The giant phlogopites that are so famous from the Franklin Marble have been re-defined as fluorophlogopite. While actual phlogopite may occur in the marble in very small quantities, its existence remains unproven by chemical analysis.

Formula: FeS2

Formula: Fe1-xS

Formula: SiO2

Formula: TiO2

Formula: ZnS

Formula: MgAl2O4