Apatite (phosphate of lime) and pyromorphite (phosphate of lead) contain a considerable amount of it. From Wordnik.com. [A Text-book of Assaying: For the Use of Those Connected with Mines.] Reference
For the assay of pyromorphite the following charge may be used: -- Ore, 20 grams; "soda," 25 grams; tartar, 7 grams; and fluor spar. From Wordnik.com. [A Text-book of Assaying: For the Use of Those Connected with Mines.] Reference
(cerussite), sulphate (anglesite), and phosphate (pyromorphite) of lead also occur as ores, but in much smaller quantities. From Wordnik.com. [A Text-book of Assaying: For the Use of Those Connected with Mines.] Reference
Cerussite (white lead), galena (blue lead), minium (red lead), anglesite, pyromorphite. From Wordnik.com. [13. Glaze oxides] Reference
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