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This material originates from the Challenger Cave Mine area near Monterrey, Mexico. Most of the specimens fluoresce three different colors depending on the wavelength of UV that is shining on them. The blue-white is the UV C (254 nm) response, the yellow in these photographs is from UV B (Philips narrow band peaking at 315 nm). However, UV A of 352 nm will also produce the same or very similar yellow response. The Pink color is under UV A (368 nm). Some specimens have multiple photos from different angles and wavelengths!
401 $30
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402 $35
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402
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402
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403 $35
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403
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403
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406 $40
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406
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406
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407 $35
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407
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407
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408 $30
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408
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409 $25
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409
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410 $25
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410
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410
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411 $35
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411
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411
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412 $30
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412
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412
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414 $35
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414
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414
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415 $30
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415
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415
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416 $25
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416
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416
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417 $30
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417
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417
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418 $20
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420 $30
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420
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420
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421 $30
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421
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421
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422 $25
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422
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422
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423 $30
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423
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423
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424 $25
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424
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424
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425 $30
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425
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425
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426 $35
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426
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426
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427 $25
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427
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427
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428 $20
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428
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428
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429 $25
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429
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429
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430 $25
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430
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430
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431 $25
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431
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431
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432 $20
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432
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432
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433 $30
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433
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434 $20
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434
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435 $20
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435
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435
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436 $20
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436
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436
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437 $20
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