01505nas a2200205 4500008004100000022001400041245012300055210006900178300001200247490000700259520078200266100002801048700002401076700002501100700002201125700002901147700002201176700003001198856007101228 2021 eng d a0035-752900aThe Rose Road Localities, Town of Pitcairn, St. Lawrence County, New York: Part 3–Minerals of the Wollastonite Skarn0 aRose Road Localities Town of Pitcairn St Lawrence County New Yor a516-5290 v953 a
The Wollastonite Skarn northeast of Pitcairn has been a productive locality for mineral collectors for nearly 140 years. It is still an active fee locality and one worth visiting. We have detailed the history (Chamberlain et al. 2018) and geology (Chiarenzelli et al. 2019) in the first two parts of this series of articles. Here we examine the mineralogy of the Wollastonite Skarn in detail.
Numerous localities of specular hematite have been found in the Grenville Province in St. Lawrence County, New York. Here, we focus on six of them: the Dodge mine, the Chub Lake prospect, the Toothaker Creek prospect, the Bowman prospect, the Whitton prospect, and the Toothaker Pond prospect. We used literature research, interviews, and personal observations to establish the history of each site as a source of mineral specimens. We examined extensive holdings of specimens from each site in the New York State Museum. We used sight identification, chemical tests, x-ray diffraction, and scanning electron microscopy with energy dispersive spectroscopy as necessary to identify all the mineral species present. We had determinations made of the stable oxygen isotope content of quartz, hematite, and calcite from the Chub Lake prospect, reported as 18O relative to Vienna Standard Mean Ocean Water (VSMOW). We conclude that these occurrences formed from groundwaters at a temperature of about 170 °C in areas of low topography on the surface of the Precambrian basement rocks. Two hypotheses for this process are presented and evaluated. Well-crystallized specimens of bladed specular hematite and Cumberland-habit quartz are the most common minerals found. Noteworthy accessory crystallized minerals include barite, calcite, and goethite. All six deposits are relatively free of sulfides, so that secondary goethite formed from weathering of iron-rich carbonates at some sites. It is likely that more such deposits will be discovered in this region in the future.
10aoxygen stable isotopes10aspecular hematite10aSt. Lawrence Co. NY1 aChamberlain, Steven, C.1 aLupulescu, M., V.1 aBailey, D., G. uhttps://www.mdpi.com/2075-163X/9/9/56700677nas a2200193 4500008004100000022001400041245009600055210006900151300001400220490000700234100002800241700002500269700002000294700002400314700002200338700003000360700002200390856007100412 2018 eng d a0035-752900aThe Rose Road Localities, Town of Pitcairn, St. Lawrence County, New York: Part 1—History0 aRose Road Localities Town of Pitcairn St Lawrence County New Yor a442 - 4530 v931 aChamberlain, Steven, C.1 aRobinson, George, W.1 aRobinson, Susan1 aWalter, Michael, R.1 aBailey, David, G.1 aChiarenzelli, Jeffrey, R.1 aLupulescu, M., V. uhttps://www.tandfonline.com/doi/full/10.1080/00357529.2018.1477011