Specimens Kidwellite is a rare, typically yellow-green phosphate mineral. Its color is distinctive as well as its compact encrusting crystal habit. It is found in phosphate deposits with other rare phosphates from classic localities such as Cornwall, England. Color is yellow-green, pale green or yellow. Luster is vitreous.
Specimens are translucent to transparent.
Cleavage is poor. Fracture is fibrous. Streak is green. Associated Minerals include strengite , beraunite , dufrenite , rockbridgeite and limonite . Best Field Indicators are crystal habit, color, associations and streak.