Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA

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Allanite-(Ce) : {CaCe}{Al₂Fe²⁺}[O\|OH\|SiO₄\|Si₂O₇]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Specimen showing freshly broken, lustrous interior; 5x4.3x3cm; Collected by Rudy Bolona, May 23, 2009.
	Photo ID: 232164 View Count: 29
Allanite-(Ce) : {CaCe}{Al₂Fe²⁺}[O\|OH\|SiO₄\|Si₂O₇]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Nodular, solid mass with a bastnaesite surface alteration; 5x3.3x2.5cm; Allanite specimens are quite scarce from here. Collected by rudy bolona, May 23, 2009.
	Photo ID: 232163 View Count: 22
Biotite
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA A very large crystal that fell off the pegmatite wall; These pegmatites are well known for their large biotite aggregates. This one would make a cool decorator piece in my drive way. I couldn't fit it in my backpack though. Photo; Rudy Bolona, May 24, 2009.
	Photo ID: 232148 View Count: 76
Microcline : K[AlSi₃O₈]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Well formed crystals; 5x3.5x3cm; Collected by Rudy Bolona, May 23, 2009.
	Photo ID: 232162 View Count: 32
Thorite : (Th,U)[SiO₄], Thorogummite : (Th,U)[(OH)_4x\|(SiO₄)_1-x]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Black glassy thorite altering to yellow thorogummite; 3.6x2.7x2.2 cm; 4340 CPM; This pegmatite has two different types of thorite, a black glassy type and a brick red variety. Collected by Rudy Bolona, May 24, 2009.
	Photo ID: 232158 View Count: 36
Thorite : (Th,U)[SiO₄]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Brick-red crystalline sections; 11x8x5.5 cm; 3418 CPM; Collected by Rudy Bolona, May 23, 2009.
	Photo ID: 232159 View Count: 32
Thorite : (Th,U)[SiO₄], Synchysite-(Y) : Ca(Y,Ce)[F\|(CO₃)₂], Autunite : Ca(UO₂)₂(PO₄)₂·11H₂O
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA This pegmatite has some very interesting association specimens; 10x8x5cm; 2022 CPM; Collected by Rudy Bolona, May 24, 2009.
	Photo ID: 232156 View Count: 30
Thorogummite : (Th,U)[(OH)_4x\|(SiO₄)_1-x]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Thorite crystal altered to yellow thorogummite; 1.3 cm across; Collected by Rudy Bolona, May 23, 2009.
	Photo ID: 232161 View Count: 54
Thorogummite : (Th,U)[(OH)_4x\|(SiO₄)_1-x], Thorite : (Th,U)[SiO₄]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA This is yellow thorogummite and black thorite which I collected at the Seerie Pegmatite on 8/15/09. It measures 1.3" x 1.1"
© Jim Hall 2009	Photo ID: 246147 View Count: 26
Topaz : Al₂[(F,OH)₂\|SiO₄]
	Seerie pegmatite (Cooper pegmatite), South Platte Pegmatite District, Jefferson Co., Colorado, USA Crystals in core of pegmatite; Approx. 30 cm long. This mine produced around one ton of topaz. Photo; Rudy Bolona, May 24, 2009.
	Photo ID: 232147 View Count: 88