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  • Rocks: Hard, Soft, Smooth, and Rough (Amazing Science)

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Buy from Amazon $7.52$1.84 $10.00 $6.67 $3.33 $0.00 Dec Mar Jun Sep Dec Mar Jun Sep Dec Mar Jun 2014 2015 2016 $7.15, Sep 10 - Aug 13$7.15, Sep 10 - Aug 13$3.51, May 3 - Jun 11$3.43, May 3 - Jun 5$7.15, Sep 10 - Aug 13$3.51, May 3 - Jun 11$3.16, Jun 7 - Jun 11$7.15, Sep 10 - Aug 13$3.14, Jun 12 - Jun 13$3.06, Jun 12 - Jun 13$7.15, Sep 10 - Aug 13$3.05, Jun 14 3:03 pm$2.97, Jun 14 3:03 pm$7.15, Sep 10 - Aug 13$2.94, Jun 16 - Jul 21$2.86, Jun 16 - Jul 21$7.15, Sep 10 - Aug 13$2.85, Jul 23 4:28 am$2.77, Jul 23 4:28 am$7.15, Sep 10 - Aug 13$2.81, Jul 24 - Jul 30$2.73, Jul 24 - Jul 31$7.15, Sep 10 - Aug 13$2.89, Jul 31 - Aug 18$2.73, Jul 24 - Jul 31$7.15, Sep 10 - Aug 13$2.89, Jul 31 - Aug 18$2.78, Aug 1 - Aug 2$7.15, Sep 10 - Aug 13$2.89, Jul 31 - Aug 18$2.81, Aug 3 - Aug 18$7.16, Aug 14 - Sep 15$2.89, Jul 31 - Aug 18$2.81, Aug 3 - Aug 18$7.16, Aug 14 - Sep 15$2.89, Aug 22 - Sep 4$2.73, Aug 20 - Aug 22$7.16, Aug 14 - Sep 15$2.89, Aug 22 - Sep 4$2.81, Aug 23 - Sep 4$7.16, Aug 14 - Sep 15$5.00, Sep 5 6:22 pm$2.86, Sep 5 - Sep 9$7.16, Aug 14 - Sep 15$3.23, Sep 6 - Sep 8$2.86, Sep 5 - Sep 9$7.16, Aug 14 - Sep 15$6.72, Sep 10 1:43 pm$4.27, Sep 10 1:43 pm$7.16, Aug 14 - Sep 15$4.27, Sep 12 - Sep 19$4.06, Sep 12 - Sep 15$7.15, Sep 16 - Oct 6$4.27, Sep 12 - Sep 19$4.05, Sep 16 - Sep 19$7.15, Sep 16 - Oct 6$3.21, Sep 20 - Sep 29$3.13, Sep 20 - Sep 29$7.15, Sep 16 - Oct 6$3.29, Sep 30 - Oct 17$3.21, Sep 30 - Oct 17$5.03, Oct 7 - Oct 8$3.29, Sep 30 - Oct 17$3.21, Sep 30 - Oct 17$7.15, Oct 9 - Oct 10$3.29, Sep 30 - Oct 17$3.21, Sep 30 - Oct 17$5.03, Oct 11 - Oct 13$3.29, Sep 30 - Oct 17$3.21, Sep 30 - Oct 17$7.15, Oct 14 - Nov 13$3.29, Sep 30 - Oct 17$3.21, Sep 30 - Oct 17$7.15, Oct 14 - Nov 13$3.55, Oct 18 - Oct 23$3.46, Oct 18 - Oct 26$7.15, Oct 14 - Nov 13$3.53, Oct 24 - Oct 29$3.46, Oct 18 - Oct 26$7.15, Oct 14 - Nov 13$3.55, Oct 29 5:40 am$3.53, Oct 24 - Oct 29$7.15, Oct 14 - Nov 13$3.54, Oct 31 - Nov 10$3.54, Oct 31 - Nov 13$7.15, Oct 14 - Nov 13$3.54, Oct 31 - Nov 13$3.13, Nov 13 4:08 am$7.21, Nov 15 - Nov 19$3.98, Nov 17 - Nov 19$2.56, Nov 17 6:55 pm$7.28, Nov 20 - Nov 24$3.97, Nov 20 - Nov 24$2.38, Nov 20 1:26 pm$7.28, Nov 20 - Nov 24$3.97, Nov 20 - Nov 24$2.26, Nov 22 5:11 pm$7.28, Nov 20 - Nov 24$3.97, Nov 20 - Nov 24$2.15, Nov 24 7:34 pm$7.35, Nov 25 - Nov 28$3.95, Nov 26 - Nov 27$1.94, Nov 27 9:10 pm$7.42, Nov 29 - Dec 4$3.94, Nov 28 - Nov 29$1.84, Nov 29 11:51 pm$7.42, Nov 29 - Dec 4$3.42, Nov 30 - Dec 5$2.55, Dec 1 11:35 pm$7.49, Dec 5 - Dec 9$3.42, Nov 30 - Dec 5$2.73, Dec 5 12:43 am$7.49, Dec 5 - Dec 9$3.49, Dec 6 - Dec 12$2.63, Dec 7 12:14 am$7.49, Dec 5 - Dec 9$3.49, Dec 6 - Dec 12$2.55, Dec 9 2:22 am$7.52, Dec 10 - Mar 24$3.49, Dec 6 - Dec 12$2.46, Dec 12 7:49 am$7.52, Dec 10 - Mar 24$3.52, Dec 13 - Jan 27$2.26, Dec 14 8:29 am$7.52, Dec 10 - Mar 24$3.52, Dec 13 - Jan 27$3.14, Dec 16 - Dec 17$7.52, Dec 10 - Mar 24$3.52, Dec 27 - Dec 29$3.52, Dec 13 - Jan 27$7.52, Dec 10 - Mar 24$3.99, Dec 30 - Jan 3$3.52, Dec 13 - Jan 27$7.52, Dec 10 - Mar 24$3.87, Jan 4 - Jan 16$3.52, Dec 13 - Jan 27$7.52, Dec 10 - Mar 24$3.52, Dec 13 - Jan 27$2.00, Jan 18 6:06 am$7.52, Dec 10 - Mar 24$3.59, Jan 19 2:23 am$3.52, Dec 13 - Jan 27$7.52, Dec 10 - Mar 24$3.52, Dec 13 - Jan 27$3.51, Jan 20 - Jan 25$7.52, Dec 10 - Mar 24$3.52, Jan 27 6:08 pm$3.52, Dec 13 - Jan 27$7.52, Dec 10 - Mar 24$3.44, Jan 30 9:52 am$3.44, Jan 30 9:52 am$7.52, Dec 10 - Mar 24$3.39, Feb 1 5:47 am$3.39, Feb 1 5:47 am$7.52, Dec 10 - Mar 24$3.52, Feb 3 - Feb 12$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.38, Feb 13 - Feb 14$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.35, Feb 16 - Feb 23$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$3.87, Feb 24 - Mar 5$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.35, Mar 12 12:46 am$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.52, Mar 13 - Mar 15$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.35, Mar 17 - Mar 18$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.40, Mar 19 - Mar 29$3.52, Feb 3 - Mar 19$7.52, Dec 10 - Mar 24$4.40, Mar 19 - Mar 29$3.50, Mar 21 - Mar 23$7.52, Dec 10 - Mar 24$4.40, Mar 19 - Mar 29$3.52, Mar 24 - Mar 25$7.44, Mar 25 - Apr 3$4.40, Mar 19 - Mar 29$3.44, Mar 27 - Apr 4$7.44, Mar 25 - Apr 3$4.54, Mar 30 - Apr 1$3.44, Mar 27 - Apr 4$7.44, Mar 25 - Apr 3$4.23, Apr 2 - Apr 7$3.44, Mar 27 - Apr 4$7.36, Apr 4 - Apr 7$4.23, Apr 2 - Apr 7$3.58, Apr 6 - Apr 7$7.28, Apr 9 - Apr 16$4.20, Apr 9 - Apr 13$3.59, Apr 9 - Apr 11$7.28, Apr 9 - Apr 16$4.20, Apr 9 - Apr 13$3.58, Apr 13 8:21 am$7.28, Apr 9 - Apr 16$3.81, Apr 14 - Apr 24$3.56, Apr 16 - Apr 17$7.20, Apr 17 - Apr 20$3.81, Apr 14 - Apr 24$3.56, Apr 16 - Apr 17$7.20, Apr 17 - Apr 20$3.81, Apr 14 - Apr 24$3.60, Apr 18 - Apr 23$7.12, Apr 21 - Apr 24$3.81, Apr 14 - Apr 24$3.60, Apr 18 - Apr 23OOS $7.12, Apr 25 - Apr 27$3.81, Apr 25 11:24 pm$3.81, Apr 25 11:24 pmOOS $7.12, Apr 25 - Apr 27$3.95, Apr 27 1:00 pm$3.95, Apr 27 1:00 pm$7.04, Apr 29 - May 7$3.81, Apr 29 - May 1$3.80, Apr 30 - May 1$7.04, Apr 29 - May 7$3.79, May 3 7:18 am$3.79, May 3 7:18 am$7.04, Apr 29 - May 7$3.81, May 4 - May 13$3.78, May 4 3:02 pm$7.04, Apr 29 - May 7$3.81, May 4 - May 13$3.00, May 7 - May 21$6.96, May 9 - May 29$3.81, May 4 - May 13$3.00, May 7 - May 21$6.96, May 9 - May 29$3.87, May 14 11:49 pm$3.00, May 7 - May 21$6.96, May 9 - May 29$3.71, May 16 - Jun 1$3.00, May 7 - May 21$6.96, May 9 - May 29$3.71, May 16 - Jun 1$3.66, May 23 - May 25$6.96, May 9 - May 29$3.71, May 16 - Jun 1$3.65, May 27 - May 29$6.89, Jun 1 - Jun 3$3.71, May 16 - Jun 1$3.64, Jun 1 4:32 am$6.89, Jun 1 - Jun 3$3.27, Jun 3 1:26 pm$3.27, Jun 3 1:26 pm$6.82, Jun 5 - Jun 8$3.03, Jun 5 - Jun 10$3.03, Jun 5 - Jun 10$6.75, Jun 10 - Jun 16$3.03, Jun 5 - Jun 10$3.03, Jun 5 - Jun 10$6.75, Jun 10 - Jun 16$3.05, Jun 12 - Jun 24$3.05, Jun 12 - Jun 24$6.68, Jun 18 - Jun 22$3.05, Jun 12 - Jun 24$3.05, Jun 12 - Jun 24$6.61, Jun 24 - Jul 19$3.25, Jun 25 11:37 pm$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.43, Jun 28 12:22 am$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.42, Jun 30 1:58 am$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.41, Jul 2 - Jul 4$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.43, Jul 6 12:52 pm$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.42, Jul 9 12:26 pm$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.43, Jul 12 5:18 am$2.90, Jun 25 - Jul 14$6.61, Jun 24 - Jul 19$3.05, Jul 14 - Jul 19$2.90, Jul 17 - Jul 28$7.16, Jul 21 - Jul 23$3.44, Jul 21 3:42 pm$2.90, Jul 17 - Jul 28$7.08, Jul 25 - Aug 1$3.42, Jul 25 4:20 am$2.90, Jul 17 - Jul 28$7.08, Jul 25 - Aug 1$3.41, Jul 26 - Jul 30$2.90, Jul 17 - Jul 28$7.08, Jul 25 - Aug 1$3.97, Jul 30 - Aug 8$3.42, Aug 1 9:33 am$7.00, Aug 3 - Aug 10$3.97, Jul 30 - Aug 8$3.41, Aug 3 - Aug 5$7.00, Aug 3 - Aug 10$3.97, Jul 30 - Aug 8$3.43, Aug 6 - Aug 8$7.00, Aug 3 - Aug 10$3.67, Aug 10 - Aug 12$3.44, Aug 10 - Aug 12$6.93, Aug 12 - Aug 24$3.67, Aug 10 - Aug 12$3.44, Aug 10 - Aug 12$6.93, Aug 12 - Aug 24$3.97, Aug 14 - Aug 18$3.43, Aug 14 2:41 pm$6.93, Aug 12 - Aug 24$3.97, Aug 14 - Aug 18$3.41, Aug 18 9:57 am$6.93, Aug 12 - Aug 24$3.67, Aug 20 - Aug 28$3.66, Aug 20 - Aug 28$6.94, Aug 26 - Sep 20$3.67, Aug 20 - Aug 28$3.66, Aug 20 - Aug 28$6.94, Aug 26 - Sep 20$3.97, Aug 29 10:38 pm$3.64, Aug 29 - Sep 6$6.94, Aug 26 - Sep 20$4.16, Aug 31 7:52 pm$3.64, Aug 29 - Sep 6$6.94, Aug 26 - Sep 20$3.64, Aug 29 - Sep 6$3.41, Sep 2 - Sep 8$6.94, Aug 26 - Sep 20$3.63, Sep 8 5:04 pm$3.41, Sep 2 - Sep 8$6.94, Aug 26 - Sep 20$4.37, Sep 10 - Sep 12$3.62, Sep 10 4:57 pm$6.94, Aug 26 - Sep 20$3.61, Sep 12 - Sep 14$2.95, Sep 14 - Sep 20$6.94, Aug 26 - Sep 20$3.60, Sep 16 2:36 pm$2.95, Sep 14 - Sep 20$6.94, Aug 26 - Sep 20$3.58, Sep 18 1:48 pm$2.95, Sep 14 - Sep 20$6.94, Aug 26 - Sep 20$3.57, Sep 20 - Sep 26$2.95, Sep 14 - Sep 20$6.87, Sep 22 - Sep 28$3.81, Sep 24 - Sep 30$3.57, Sep 20 - Sep 26$6.87, Sep 22 - Sep 28$3.81, Sep 24 - Sep 30$3.55, Sep 28 12:43 pm$6.80, Sep 30 - Oct 2$3.81, Sep 24 - Sep 30$3.54, Sep 30 1:10 pm$6.80, Sep 30 - Oct 2$4.14, Oct 2 2:37 pm$3.52, Oct 2 2:37 pm$6.73, Oct 4 - Oct 10$4.01, Oct 4 4:17 pm$3.50, Oct 4 4:17 pm$6.73, Oct 4 - Oct 10$3.49, Oct 6 - Oct 8$3.48, Oct 8 8:48 pm$6.73, Oct 4 - Oct 10$3.48, Oct 10 11:23 pm$3.47, Oct 10 11:23 pm$6.66, Oct 13 - Oct 24$3.47, Oct 13 - Oct 15$3.46, Oct 13 12:25 am$6.66, Oct 13 - Oct 24$3.67, Oct 15 - Nov 16$3.47, Oct 13 - Oct 15$6.66, Oct 13 - Oct 24$3.67, Oct 15 - Nov 16$3.66, Oct 18 - Oct 26$6.59, Oct 26 - Nov 1$3.67, Oct 15 - Nov 16$3.66, Oct 18 - Oct 26$6.59, Oct 26 - Nov 1$3.67, Oct 15 - Nov 16$3.64, Oct 28 - Nov 8$6.52, Nov 3 - Nov 6$3.67, Oct 15 - Nov 16$3.64, Oct 28 - Nov 8$6.45, Nov 8 - Nov 16$3.67, Oct 15 - Nov 16$3.64, Oct 28 - Nov 8$6.45, Nov 8 - Nov 16$3.67, Oct 15 - Nov 16$3.63, Nov 10 - Nov 20$6.53, Nov 18 - Nov 20$3.98, Nov 18 5:29 pm$3.63, Nov 10 - Nov 20$6.53, Nov 18 - Nov 20$3.67, Nov 20 10:57 pm$3.63, Nov 10 - Nov 20$6.54, Nov 23 - Nov 30$3.84, Nov 23 - Dec 2$3.64, Nov 23 - Nov 25$6.54, Nov 23 - Nov 30$3.84, Nov 23 - Dec 2$3.63, Nov 27 - Nov 30$6.55, Dec 2 - Dec 12$3.84, Nov 23 - Dec 2$3.61, Dec 2 3:59 pm$6.55, Dec 2 - Dec 12$3.23, Dec 5 - Dec 7$3.23, Dec 5 - Dec 7$6.55, Dec 2 - Dec 12$3.81, Dec 10 - Dec 15$3.40, Dec 10 - Dec 12$6.56, Dec 15 - Dec 20$3.81, Dec 10 - Dec 15$3.63, Dec 15 - Dec 17$6.56, Dec 15 - Dec 20$3.63, Dec 15 - Dec 17$3.62, Dec 17 10:56 pm$6.56, Dec 15 - Dec 20$3.62, Dec 20 - Jan 12$3.61, Dec 20 11:55 am$6.57, Dec 22 - Jan 2$3.81, Dec 22 - Dec 30$3.62, Dec 20 - Jan 12$6.57, Dec 22 - Jan 2$3.62, Dec 20 - Jan 12$2.45, Jan 2 4:14 am$6.58, Jan 4 - Jan 9$3.62, Dec 20 - Jan 12$2.46, Jan 4 1:49 pm$6.58, Jan 4 - Jan 9$3.81, Jan 7 - Jan 17$3.62, Dec 20 - Jan 12$6.59, Jan 12 - Jan 14$3.81, Jan 7 - Jan 17$3.62, Dec 20 - Jan 12$6.59, Jan 12 - Jan 14$3.81, Jan 7 - Jan 17$3.60, Jan 14 1:00 pm$6.60, Jan 17 - Jan 24$3.81, Jan 7 - Jan 17$3.58, Jan 17 - Jan 19$6.60, Jan 17 - Jan 24$4.01, Jan 19 2:41 pm$3.58, Jan 17 - Jan 19$6.60, Jan 17 - Jan 24$3.57, Jan 22 4:19 am$2.61, Jan 22 4:19 am$6.60, Jan 17 - Jan 24$3.56, Jan 24 - Jan 27$3.10, Jan 24 5:40 pm$6.61, Jan 27 - Feb 3$3.56, Jan 24 - Jan 27$3.08, Jan 27 7:39 am$6.61, Jan 27 - Feb 3$3.55, Jan 29 8:51 pm$3.06, Jan 29 8:51 pm$6.61, Jan 27 - Feb 3$3.54, Feb 1 9:16 am$3.04, Feb 1 9:16 am$6.61, Jan 27 - Feb 3$3.81, Feb 3 - Feb 14$3.80, Feb 3 11:26 pm$6.62, Feb 6 - Feb 11$3.84, Feb 6 1:44 pm$3.81, Feb 3 - Feb 14$6.62, Feb 6 - Feb 11$3.81, Feb 9 3:42 am$3.81, Feb 3 - Feb 14$6.62, Feb 6 - Feb 11$3.84, Feb 11 - Feb 14$3.81, Feb 3 - Feb 14$6.63, Feb 14 - Feb 19$3.84, Feb 11 - Feb 14$3.81, Feb 3 - Feb 14$6.63, Feb 14 - Feb 19$4.00, Feb 17 4:04 am$3.80, Feb 17 4:04 am$6.63, Feb 14 - Feb 19$3.78, Feb 19 8:57 pm$3.77, Feb 19 8:57 pm$6.64, Feb 22 - Feb 28$3.77, Feb 22 4:20 pm$3.74, Feb 22 4:20 pm$6.64, Feb 22 - Feb 28$3.74, Feb 25 11:44 am$2.65, Feb 25 11:44 am$6.64, Feb 22 - Feb 28$3.72, Feb 28 4:40 am$2.61, Feb 28 4:40 am$7.16, Mar 3 - Mar 15$3.71, Mar 3 6:06 am$3.70, Mar 3 6:06 am$7.16, Mar 3 - Mar 15$3.67, Mar 8 11:30 pm$3.65, Mar 8 - Mar 15$7.16, Mar 3 - Mar 15$3.65, Mar 8 - Mar 15$3.64, Mar 15 4:43 am$7.08, Mar 21 - Mar 27$3.81, Mar 21 1:58 am$3.63, Mar 21 1:58 am$7.08, Mar 21 - Mar 27$4.00, Mar 27 12:10 am$3.59, Mar 27 12:10 am 8,578155,635 125,000 93,750 62,500 31,250 Oct Dec Feb Apr Jun Aug Oct Dec Feb Apr 2015 2016

Price Details

New

Latest $7.08 Mar 27, '16
Highest $7.52 Dec 10, '14
Lowest $5.03 Oct 11, '14
Average $7.04 (30d avg)
$6.75 (90d avg)
$6.67 (180d avg)
$6.81 (365d avg)
$7.05 (Lifetime average)
Added Sep 10, 2013

3rd Party New

Latest $3.59 Mar 27, '16
Highest $6.72 Sep 10, '14
Lowest $2.81 Aug 20, '14
Average $3.67 (30d avg)
$3.67 (90d avg)
$3.62 (180d avg)
$3.52 (365d avg)
$3.46 (Lifetime average)
Added Sep 10, 2013

3rd Party Used

Latest $4.00 Mar 27, '16
Highest $4.54 Mar 30, '15
Lowest $1.84 Nov 29, '14
Average $3.54 (30d avg)
$3.51 (90d avg)
$3.61 (180d avg)
$3.58 (365d avg)
$3.45 (Lifetime average)
Added Sep 10, 2013

Sales Rank

30 day average: 24,284
90 day average: 34,494

Product Description

The rocks you see everyday can be grouped into different types, like igneous, sedimentary, or metamorphic. Some rocks are actually minerals, and you can even find fossils in some types of rocks.

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