- Chemistry: (Fe, Mg, Mn)3(PO4)2 - 4H2O, Hydrated Iron Magnesium Manganese Phosphate.
- Class: Phosphates
- Uses: Only as mineral specimens.
Ludlamite is a classic phosphate mineral.
Known from only a few localities, it is most famous from the classic Wheal Jane Mine in Cornwall, England.
It was first discovered there (1876 - 1877) after the old mine had been reopened.
The mine was closed for a long time until recently reopened in the past three decades and was again producing some ludlamite specimens.
Ludlamite is named for Henry Ludlam, a British collector of fine rare minerals.
Specimens of ludlamite are extremely beautiful.
They are characterized by a bright green, usually apple-green color, a vitreous luster, and an interesting crystal habit.
The aggregates typically form into sprays of jaggedly pointed sheaves that are pinched in the middle like sheaves of wheat.
To own a specimen is truly a blessing for a mineral collector.
- Colors include a few shades of green, often bright apple green or colorless.
- Luster is vitreous.
- Transparency: Specimens are transparent to translucent.
- Crystal System is monoclinic; 2/m
- Crystal Habits include tabular almost pseudo-octahedral crystals also as jagged, crystalline masses and aggregate sprays or sheaves.
- Cleavage is perfect in one direction (basal).
- Fracture is uneven.
- Hardness is 3 - 4.
- Specific Gravity is approximately 3.1 - 3.2 (very slightly above average).
- Streak is white.
- Associated Minerals include
vivianite and other primary and secondary phosphates.
- Notable Occurrences include Wheal Jane Mine, Truro, Cornwall, England; la Union, Spain; Rapid Creek, Yukon, Territory, Canada; Chihuahua, Mexico; Hagendorf, Germany; Cobalt, Idaho; North Groton, New Hampshire and Custer County, South Dakota, USA.
- Best Field Indicators are crystal habit, color, locality and cleavage.